| LLTA | Lots and Lots of Thunderous (or Thundering) Applause. |
| LMAO | Laughing My Ass Off. |
| LMHO | Laughing My Head Off . |
| LOL | Laughing Out Loud |
| LSHMBA | Laughing So Hard My Belly Aches |
| LSHMBH | Laughing So Hard My Belly Hurts. |
| LTHTT | Laughing Too Hard To Type |
| LTNS | Long Time No See |
| LTNT | Long Time, No Type. |
| LTS | Laughing to Self. |
| LUWAMH | Love You With All My Heart. |
| LY | Love You. |
| MLA | Multiple Letter Acronym. |
| MOF | Matter Of Fact. |
| MOTAS | Member Of The Appropriate Sex |
| MOTD | Message of the day |
| MOTOS | Member Of The Opposite Sex |
| MOTSS | Member Of The Same Sex |
| MTF | more to follow |
| MTFBWY | May The Force Be With You. |
| MYOB | 1. Mind Your Own Business (chat). 2. A small business accounting package from Best!Ware. |
| NAVY | Never Again Volunteer Yourself. |
| NBD | No Big Deal. |
| NFW | No Friggin' Way!. |
| NHOH | Never Heard Of Him/Her |
| NIH | Not Invented Here. |
| NIMBY | Not In My Back Yard. |
| NINO | 1. Nothing In, Nothing Out. 2. No Input, No Output. |
| NOYB | None Of Your Business. |
| NP | No Problem. |
| NQA | No Questions Asked. |
| NTIM | Not That It Matters. |
| NTIMM | Not That It Matters Much. |
| NTW | Not To Worry. |
| NTYMI | Now That You Mention It. |
| O | Over (completion of communication) |
| OATUS | On A Totally Unrelated Subject. |
| OAUS | On An Unrelated Subject. |
| OBO | Or Best Offer |
| OBTW | Oh, By The Way |
| OIC | Oh, I See |
| ONNA | Oh No, Not Again. |
| ONNTA | Oh No, Not This Again. |
| OO | Over and Out (end of communication) |
| OOTC | Obligatory On-Topic Comment. |
| OTF | On the Floor (laughing) |
| OTFL | On the Floor Laughing |
| OTL | Out To Lunch. |
| OTOH | On The Other Hand |
| OTOOH | On The Other Other Hand. |
| OTT | Over The Top; too much |
| OTTH | On The Third Hand. |
| OTTOMH | Off The Top Of My Head. |
| OWTTE | Or Words To That Effect. |
| PABG | Packing a Big Gun. |
| PDS | Please Don't Shout. (Shouting in chat mode is typing all in capital letters, which is considered rude.) Example: PLEASE DON'T SHOUT. |
| PLOKTA | Press Lots Of Keys To Abort. |
| PMBI | Pardon My Butting In. |
| PMF | 1. Pardon My French. 2. Pure Freaking Magic. |
| PMFBI | Pardon Me For Butting In |
| PMFJI | Pardon Me For Jumping In |
| PMIGBOM | Put Mind In Gear, Before Opening Mouth. |
| PMJI | Pardon My Jumping In |
| PNCAH | Please, No Cursing Allowed Here |
| POSSLQ | Person Of Opposite Sex Sharing Living Quarters. |
| ppl | People |
| PTMM | Please Tell Me More |
| R U THERE? | Are you there? |
| RAEBNC | Read And Enjoyed, But No Comment. |
| re | 1 Hello again; regreet 2 In regard to |
| rehi | Hi again |
| RHIP | Rank Has Its Privileges. |
| RL | Real Life (an abbreviation used in MUDs and chat) |
| RLCO | Real Life Conference. |
| ROFL | Rolling On Floor Laughing. |
| ROFLASTC | Rolling On Floor Laughing And Scaring The Cat. |
| ROFLGO | Rolling On Floor Laughing Guts Out. |
| ROFLMAO | Roll On Floor Laughing My Arse Off. |
| ROTF | Rolling On The Floor |
| ROTFL | Rolling On The Floor Laughing |
| ROTFLAHMS | Rolling On The Floor Laughing And Holding My Sides. |
| ROTFLOL | Rolling On The Floor Laughing Out Loud |
| RRQ | Return Receipt Request. |
| RSN | Real Soon Now |
| RSVP | Respondez S'il Vous Plait French for "please reply"; a notation often found on invitations |
| RTBM | Read The Bloody Manual |
| RTFAQ | Read The Frequently Asked Questions |
| RTFF | Read The Freaking FAQ. |
| RTFM | Read The F------ Manual A gentle suggestion to users who ask questions they could have answered themselves with a little research |
| RTM | Read The Manual |
| RTSM | Read The Silly Manual. |
| RTWFQ | Read The Whole Friggin' Question. |
| RYFM | Read Your Friendly Manual |
| RYS | Read Your Screen. |
| S | Smile |
| SAPFU | Surpassing All Previous Foul Ups. |
| SCNR | Sorry, Could Not Resist. |
| SEC | Wait a second |
| SETE | Smiling Ear To Ear. |
| SFLA | Stupid Four Letter Acronym. |
| SICS | Sitting In Chair Snickering. |
| SLM | See Last Mail. |
| SMOP | Small Matter of Programming. |
| SNAFU | Situation Normal: All Fouled Up |
| SO | Significant Other |
| SOL | SH** Out Of Luck |
| SOS | 1. Same Old Stuff. 2. Help!. |
| SOW | Speaking Of Which. |
| SUFID | Screwing Up Face In Disgust. |
| SWIM | See What I Mean? |
| SWL | Screaming With Laughter. |
| SYS | See You Soon. |
| TAF | That's All, Folks!. |
| TAFN | That’s All For Now |
| TANJ | There Ain’t No Justice |
| TANSTAAFL | There Ain’t No Such Thing As A Free Lunch |
| TARFU | Things Are Really Fouled Up. |
| TBYB | Try Before You Buy. |
| TDM | Too Darn Many. |
| TFS | Three Finger Salute (Ctl-Alt-Del). |
| TFTHAOT | Thanx For The Help Ahead Of Time. |
| TFTT | Thanks For The Thought. |
| TGAL | Think Globally, Act Locally. |
| THX | Thanks |
| TIA | Thanks In Advance |
| TIC | Tongue In Cheek |
| TINWIS | That Is Not What I Said. |
| TNSTAAFL | There's No Such Thing As A Free Lunch. |
| TNTL | Trying Not To Laugh |
| TNX | Thanks |
| TNXE6 | Thanks A Million ("E6" means 10 to the 6th power = a million) |
| TOBAL | There Oughta Be A Law. |
| TOBG | This Oughta Be Good. |
| TOY | Thinking Of You. |
| TPTB | The Powers That Be |
| TRDMC | Tears Running Down My Cheeks. |
| TSR | Totally Stupid Rules. |
| TTBOMK | To The Best Of My Knowledge |
| TTFN | Ta Ta For Now |
| TTKSF | Trying To Keep a Straight Face |
| TTUL | Talk To You Later. |
| TTYAWFN | Talk To You A While From Now. |
| TTYL | Talk To You Later |
| TTYT | Talk To You Tomorrow. |
| TYCLO | Turn Your CAPS LOCK Off (Quit Shouting). |
| TYVM | Thank You Very Much |
| UOK | Are You OK? |
| WAEF | When All Else Fails. |
| WB | Welcome Back |
| WDYMBT | What Do You Mean By That?. |
| WDYT | What Do You Think? |
| WIBAMU | Well, I'll Be A Monkey's Uncle. |
| WIBNI | Wouldn’t It Be Nice If |
| WMMOWS | Wash My Mouth Out With Soap. |
| WNOHGB | Where No One Has Gone Before. |
| WOA | Work Of Art. |
| WOTAM | Waste Of Time And Money. |
| WRT | With Regard To, or With Respect To |
| WT | Without Thinking. |
| WTB | Want To Buy |
| WTF | What The F***? |
| WTG | Way To Go! |
| WTGP | Want To Go Private? |
| WTH | What the hell? |
| WTTM | Without Thinking Too Much. |
| WYGISWYPF | What You Get Is What You Pay For |
| XOXOXO | Kisses and hugs |
| YABA | Yet Another Bloody Acronym |
| YAOTM | Yet Another Off-Topic Message. |
| YAUN | Yet Another Unix Nerd |
| YGLT | You're Gonna Love This .... |
| YGTI | You Get The Idea? |
| YGWYPF | You Get What You Pay For |
| YIU | Yes, I Understand |
| YIWGP | Yes, I Will Go Private |
| YKYARW | You Know You're A Redneck When . . .. |
| YMMV | Your Mileage May Vary (or your experience could be different) |