Ysomfr 

It is an acronym. You Set Off My Funny Receptors. Similar to "lol" or "rofl."

Bob: Two potatoes are in an oven, one says hey, the other says "holy crap it's a talking potato"
Jill: Hahaha. Ysomfr.

Ysomfr by The Uberness December 15, 2008

YDOMFR 

Yummy Down on My Fucking Rod:

Peoeple who act like complete cocks on IRC, may be told to YDOMFR.

***** Numb1 has joined #pu-priv
<chriss3r> lo Numb1
<Numb1> YDOMFR
<chriss3r> ;<

YDOMFR by meeps February 15, 2005