U: 

Sucking up to someone or some people to get something you want.

Little Timmy: I got an A in math class after getting an F on my progress report Jeff!!!

Jeff: How did you do it Little Timmy?

Little Timmy: I U: her of course!

Jeff: U:?

Little Timmy: Yeah, I gave her a cookie and 20 bucks.

U: by TH3 L337 KR3W August 22, 2008

u 

A shortened version of the word "you" used by ignorant preteen assholes who are too lazy to type out an extra two letters.

Moron: liek omgz wtf iz up wit u omg u suk

Smart person: Shut the fuck up.

u by Fagromyass April 1, 2008

(U) 

The 'broken-heart' or 'heartbroken' emoticon on msn.

He broke my heart (U)

I loved him (U)

R.I.P (U)

(U) by KrayziieLilBaybiie..x November 3, 2008

u 

1. The 21st letter of the alphabet

2. A lazy way to write, text, or spell the word, "you."
Is it really that hard to make 2 fucking letters? No. Watch:
Y-O-U.

Learn to spell, dickheads.

1.abcdefghijklmnopqrstUvwxyz

u by 333SlayerCFH August 15, 2010

u 

A letter of the English alphabet.

Today's letter is: 'u'!

u by ROAR! Bad kitty. May 9, 2004

u 

One of various misspellings that make those of us who can read, write, and speak English well crazy.

u r like so kewl

u by Dan February 29, 2004

u 

1. One of the 26 letters of the western alphabet.

2. Short for "you" a rather l33t term or used by little kids under 12.

3. An extra letter that is inserted in "Proper English"

u rox!
I say old bean. That "armour" has no "colour".

u by vulpnine December 4, 2004