0-9

* 10x — Thanks[1]
* 1337 — From the word Leet, derived from the word elite[2]
* 2 — too, or to[1]
* 2L8 — Too late[3]
* 2U2 — To you too[3]
* <3—love;asidewaysheart.[4]
*</3—lostlove(orsometimeshate);asidewaysheartwithaslashthroughit.>
* RO(T)FL — Rolling on (the) floor laughing[6]
* RO(T)FLMAO — Rolling on (the) floor laughing my ass off[6]
* RO(T)FLOL — Rolling on (the) floor laughing out loud[6]
* RSN — Real soon now (often used sarcastically)[6]
* RTA - Read The Article
* RTFB — Read the fucking binary (or book)[6]
* RTFS — Read the fucking source[6]
* RTFM/RTM — Read the (fucking) manual[6]

S

* SCNR — Sorry, could not resist[8]
* sk8/sk8r — skate/skater[7]
* Smiley — Another name for emoticons[10]
* SMH — Shaking my head[7]
* SNAFU — Situation normal: all (fucked/[6]fouled) up[1]
* Snail mail — Normal paper mail service[10]
* SOL - Shit Outta Luck
* Spider — The program behind a search engine[10]
* Sry - Sorry[9]
* STFU — Shut the fuck up[29]
* STFW — Search the fucking web[6]
* Soz — Sorry[9]
* SU - Shut up
* SWIM — Someone Who Isn't Me[1]
* SYM - Shut your mouth
* Srsly? - Seriously?

T

* TANSTAAFL — There ain't no such thing as a free lunch, from Robert A. Heinlein's novel The Moon Is a Harsh Mistress[6]
* TBF — Time between failures[6]
* TBH, TBQH — To be (quite) honest[7]
* TCIO - This converstion is over.
* TG — That's great[7]
* TGIF — Thank God it's Friday[1]
* TH(N)X, TNX or TX — Thanks[9]
* TIA — Thanks in advance[6]
* TINC — There Is No Cabal, a term discouraging conspiracy theories[6]
* TISNF - This is so not fair[1]
* TL;DR - Too Long; Didn't Read, an admonishment that a post is too lengthy or lacks worthwhile content[1]
* TMI — Too much information[1]
* TOS — Terms of service[6]
* TTBOMK — To the best of my knowledge[8]
* TTFN — Ta ta for now[6]
* TTT — To the top, used in forums to bump a thread[1]
* TTTH — Talk to the hand[7]
* TTYL — Talk to you later (also spelled TTUL, T2UL or T2YL)[6]
* TTYS — Talk to you soon [1]
* TTYTT — To Tell You The Truth[1]
* Tweedler — One who has deep love for all computer related technology and gadgets[10]
* TWIMC — To Whom It May Concern[7]
* TY — Thank you[9]
* TYT — Take your time[6]
* TYVM — Thank you very much[16]

U

* U, Ur — You, your[1]
* UTFSE — Use the fucking search engine[1]

V

* VB(SE)G — Very big (shit-eating) grin[3].
* VEG/S — Very evil grin/smile[3].
* VWG/S — Very wicked grin/smile[3].

W

* w00t, w00T or WOOT — First two express exuberance, the latter is a backronym for the term "We Own the Other Team".[1]
* W/ or W/O — With or without[1]
* WB — Welcome back[6]
* WD — Well Done[1]
* W/E — Whatever[1]
* WP — Well Played[7]
* WRT — With respect / regard to[6]
* WTB — Want to buy[1]
* WTF — What the fuck[6]
* WTG — Way to go[6]
* WTH — What the hell, What the hack[6]
* WTS — Want to sell[1]
* WTT — Want to trade[1]
* WUG — What you got?[1]
* WUBU2 — What (have) you been up to?[1]
* WUU2 — What (are) you up to?[1]
* WUW — What you want?[1]
* WYSIWYG — What you see is what you get[6][10]
* W8 — Wait[1]
* WOW - World of Warcraft[1]

Y

* Y — Why[9]
* YA RLY — Yeah Really (invariably preceeded by "O RLY")
* YHBT — You have been trolled.[7] Typically used as "YHBT. YHL. HAND."
* YHL — You have lost[7], see YHBT.
* YKW — You know what?[13]
* YMMV — Your mileage may vary.[9]
* YT — You there?[1]
* YTMND — You're The Man Now, Dog[1]
* YW — You're welcome.[1]
* YOYO — You're On Your Own.[1]
* YOYOW - You own your own words. [1]

Z

* ZOMG (sometimes OMGZ)— An intentional misspelling of the initials for "Oh My God/Gosh" used to indicate extreme excitement[9]

See also

* Internet slang
* Emoticon
* Internet
* Farkisms
* Slang
* Leet
* List of online-gaming slang
* List of Internet slang specific to thread-based communication
* List of computer-related jargon
* List of blogging terms
* Computer jargon
* List of computing and IT abbreviations
* The Jargon File