U 

Atomic symbol for uranium, a radioactive, fissile element named for Uranus.

N Korea: u got ne uranium?

Pak: y

N Korea: lol

US: u got ne uranium?

N Korea: n
US: k

U by LexAveNYC June 17, 2009

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. 

.u. Is a very happy face originally typed by YouTube extraordinaire Scykoh. It is a very happy face that symbolizes Joy .u.

I'm gonna name it Joy .u. doesn't that look like the happiest face you've ever seen in your miserable life? You bet it is.

.u. by Friendly Space Bear July 31, 2018

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