| Abbreviation | Definition |
|---|---|
| TYT | Take Your Time |
| TYVM | Thank You Very Much |
| U | You |
| U2 | You Too |
| UATW | You Are Too Wonderful |
| UBG | U Be Good |
| UBL | U Be Lucky |
| UBN | U Be Nuts |
| UBX | U Be eXcellent |
| UBZ | U Be Zonked |
| UCS | Untried Cat Schlep |
| UD | Usually Do |
| UDB | U Dim Bulb! |
| UDM | U Da Man |
| UGB | U Gotta Be .... |
| UGLY | Understanding Generous Lovable You |
| UMTWUTM | U Mean The Whole Universe To Me |
| UN | Utter Nonsense |
| UNF | UNFortunately |
| UNG | U No Good |