| Acronym | Meaning |
 | XLNT | Excellent |
| XME | Excuse Me |
| XOXO | Hugs And Kisses |
| XQZT | Exquisite |
| XTC | Ecstasy |
| Y | Why? |
| Y! | Typical Man |
| YA | Yet Another |
| YABA | Yet Another Bloody Acronym |
| YACC | Yet Another Calendar Company |
| YAFIYGI | You Asked For It You Got It |
| YAOTM | Yet Another Off Topic Message |
| YAUN | Yet Another Unix Nerd |
| YBF | You've Been F*cked |
| YBS | You'll Be Sorry |
| YBY | Yeah Baby Yeah |
| YBYSA | You Bet Your Sweet Ass |
| YCT | Your Comment To |
| YDKM | You Don't Know Me |
| YGBK | You Gotta Be Kidding |
| YGBSM | You Gotta Be Sh*tting Me |
| YGLT | You're Gonna Love This |
| YGTBK | You've Got To Be Kidding |
| YGWYPF | You Get What You Pay For |
| YHM | You Have Mail |
| YIC | Yours In Christ |
| YIU | Yes, I Understand |
| YIWGP | Yes, I Will Go Private |
| YKW | You Know What |
| YKWIM | You Know What I Mean |
| YM | Your Mother |
| YMAK | You May Already Know |
| YMMV | Your Mileage May Vary |
| YNK | You Never Know |
| YOYO | You're On Your Own |
| YR | Yeah Right |
| YRYOCC | You're Running On Your Own Cuckoo Clock |
| YS | You Stink(er) |
| YSAN | You're Such A Nerd |
| YSIC | Why Should I Care? |
| YSK | You Should Know |
| YSYD | Yeah, Sure You Do |
| YTB | You're The Best |
| YTRNW | Yeah That's Right, Now What? |
| YTTT | You Telling The Truth |
| YUPPIES | Young Urban Professionals |
| YW | You're Welcome |
| YWIA | You're Welcome In Advance |
| YY4U | Too Wise For You |
| YYSSW | Yeah Yeah Sure Sure Whatever |
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