In realtà questo è un post ad personam. Nello specifico per me stesso che non essendo un habitué delle chat dimentico sempre il significato degli acronimi che vengono scritti. Eccone una lista aggiornata.
Ovviamente sono in inglese. Se c’è qualche difficoltà mi offro per una traduzione ASAP 😉

• 121: one to one
• ADN: any day now
• ADR/addy: address
• AFAIK: as far as I know
• AFK: away from keyboard
• A/S/L: age, sex, location (or just “ASL”)
• ASAP: as soon as possible
• B4: before
• B4N: bye for now
• BBFD: big bad forum discussion
• BBL: be back later
• BF: boyfriend or best friend
• BFF: best friends forever
• BFN: bye for now
• BG: big grin
• BRB: be right back
• BRT: be right there
• BTA: but then again
• BTW: by the way
• C: see?
• CID: crying in disgrace
• CNP: continued [in my] next post
• CP: chat post
• CU: see you
• CUL: see you later
• CYA: see you (later)
• CYO: see you online
• DBAU: doing business as usual
• DD, DH, DS, DW: dear daughter, dear husband, dear son, dear wife (often used on boards where you discuss personal things, but wish to keep private the names of your loved ones)
• EIP: editing in progress
• FTW: for the win or f*** the world
• FUD: fear, uncertainty, and doubt
• FWIW: for what it’s worth
• FYI: for your information
• G2G or GTG: got to go
• G: grin
• GA: go ahead
• GAL: get a life
• GF: girlfriend
• GFN: gone for now
• GFY: go f*** yourself/good for you
• GG: gotta go/good game
• GJ: good job
• GL: good luck
• GMBO: giggling my butt off
• GMTA: great minds think alike
• GSOH: good sense of humor
• GTFO: get the f*** out
• GTG or G2G: got to go or get together
• GYPO: get your pants off
• H2G: have to go
• HAGN: have a good night
• HDOP: help delete online predators
• HHIS: hanging head in shame
• Homg: same as OMG
• IAC: in any case
• IANAL: I am not a lawyer (but)
• IAWTC: I agree with this comment
• IC: I see
• IDC:I don’t care
• IDK: I don’t know
• IFSFWI: if the shoe fits, wear it!
• IIRC: If I recall correctly
• ILU: I love you
• ILY: I love you
• IMNECTHO: in my not-even-close-to-humble opinion
• IMNSHO: in my not so humble opinion
• IMO: in my opinion; or “IMHO” – in my humble/honest opinion
• IOW: in other words
• IPN: I’m posting naked
• IRL: in real life
• IWSN: I want sex now
• JC: just chilling
• K: all right
• KFY: kiss for you
• KTHX: Okay, thanks.
• JK: just kidding
• JSUK: just so you know
• KPC: keeping parents clueless
• L8R: later
• LAFFO: laughing out loud
• LBR: loser beyond repair
• LD: later, dude
• LDR: long distance relationship
• LLTA: lots and lots of thunderous applause
• LMIRL: let’s meet in real life
• LMAO: laughing my *** off
• LMSO: laughing my socks off
• LMFAO: laughing my f*** a** off
• LMK: Let Me Know
• LOL: laughing out loud, lots of love
• LQTS: laughing quietly to self
• LTP: learn to play (L2P)
• LTR: longterm relationship
• LULAB: love you like a brother
• LULAS: love you like a sister
• MML: making me laugh
• MMORPG: massively multiplayer online role playing game
• MOOS: member(s) of the opposite sex
• MOSS/MOTSS: member(s) of the same sex
• M/F: male or female
• N1: nice one
• NALOPKT: not a lot of people know that
• NE1: anyone
• NFI: no f****** idea
• NFW: no f****** way
• NIAGW: not in a gay way
• NIFOC: naked in front of computer
• NO1: no one
• NSFW: not safe for work
• NP: no Problem
• NVM: nevermind
• NM: not much, nothing much, never mind
• OIC: ohh I see
• OMG: oh my God, oh my goodness, oh my gosh
• OMGBBQWTF: oh my God, Bar-b-q, What The F*** (surprise and confusion)
• OMFG: Oh my f*****g God
• OLL: oh, Lordy, Lordy!
• OLL: online love
• OMW: on my way
• OTOH: on the other hand
• OTW: on the way
• P911: parent alert
• PAL: parents are listening
• PAW: parents are watching
• PIR: parent in room
• POS: parent over shoulder / Piece of S***
• PLZ: please
• PlzKThx: Please. ok? Thanks. (Thanks in advance)
• PlzKThxNo-Re: Please, ok, Thanks, No-Read (sarcasm)
• PL0x or PLOX: same as please
• Pwn: to triumph (not actually an acronym, but rather a misspelling of own)
• PDA: public display [of] affection
• QFT: quoted for truth
• RBA: right back at you (right back atcha)
• RL: real life
• RTFM: read the f*****g manual
• RTFO: rock the f***** out
• ROFL: rolling on floor laughing
• ROTFLOL: rolling on the floor laughing out loud
• ROFLMAO: rolling on the floor laughing my a** off
• RPG: role playing games
• RP: roleplay
• SA: something awful
• SGXK: set a good example for the kiddies
• SHID: slaps head in disgust
• SLAP: sounds like a plan
• SLGF: secondlife girlfriend
• SO: significant other
• SOMY: sick of me yet?
• SorG: straight or gay
• SOT: short of time
• SUF: shut up fool
• STFU: shut the **** up
• STHU: shut the h*** up
• TDTM: talk dirty to me
• THX: thanks
• TIA: thanks in advance
• TMI: too much information
• TTFN: ta-ta for now
• TTYL: talk to you later
• TTLY: totally
• TY: thank you
• U: you (common); how are you?; or you do it!
• UW: you’re welcome
• WAYT: what are you thinking?
• WB: welcome back/ write back
• WDYT: what do you think
• WFM: works for me
• WIBNI: wouldn’t it be nice if
• WIP: work in progress
• WTGP: want to go private?
• WTG: way to go
• WTF: what the ****, alternatively Where’s The Food
• WUIP: wind up in progress
• WYCM: will you call me?
• WYSIWYG: what you see is what you get
• Y: why do you ask?
• YM: young man
• YMMV: your mileage may vary
• YTMND: you’re the man now, dog
• YW: you’re welcome
• ZOMG: same as OMG

[via wikiHow]