Internet Slang: U- Z

U
U - You
UTFSE - Use the fucking search engine
UGO - You got Owned
URS - You Really Suck

V
W
w00t, w00T or WOOT - First two express exuberance, the last is a backronym for the term "We Own the Other Team".
W/ or W/O - With or without
WB - Welcome back
W/E - Whatever
W/E - Weekend
WRT - With respect / regard to
WTB - Want to buy
WTF - What the fuck
WTG - Way to go
WTH - What the hell
WTS - Want to sell
WTT - Want to trade
WUG - What you got?
WUBU2 - What (have) you been up to?
WUU2 - What (are) you up to?
WYSIWYG - What you see is what you get
W8 – Wait

Y
YAGNI - You Ain't Gonna Need It.
YAGTOH - you are going to own him.
YHBT - You have been trolled.
YKW - You know what?
YMMV - Your mileage may vary.
YOYO - You're On Your Own.
YTMND - You're The Man Now, Dog
YW - You're welcome.

Z
ZOMG - An intentional misspelling of the acronym shorthand for "Oh My Gawd" and pronounced "Zoh My Gawd" This version is mainly used in jest or to ridicule people who use abbreviations like OMG and OMFG