OSMC

"Oh Suck My Cock"
An online abbreviation, used as a retort to , well, anything.

Some Guy: Hi!
You: OSMC

by Joseph Staline June 07, 2005

OFMA

"Oh Fuck My Ass"
An internet abbreviation, used like "kiss my ass" or "suck my dick" but with more kick.

Online loser: Go back to the ghetto, fag!
You: OFMA

by Joseph Staline June 07, 2005