| U | You |
| U Up | Are You Up? |
| U2 | You Too |
| U8 | You Ate? |
| UBS | Unique Buying State |
| UCWAP | Up a Creek Without A Paddle |
| UG2BK | You've Got To Be Kidding |
| U-L | You Will |
| unPC | unPolitically Correct |
| UNTCO | You Need To Chill Out |
| UPOD | Under Promise Over Deliver |
| UR | You Are |
| UR2K | You Are Too Kind |
| URAPITA | You Are A Pain In The Ass |
| URSAI | You Are Such An Idiot |
| URW | You Are Welcome |
| URWS | You Are Wise |
| URYY4M | You Are Too Wise For Me |
| US | You Suck |
| USP | Unique Selling Proposition |
| UV | Unpleasant Visual |
| UWIWU | You Wish I Was You |
U
