OMAT, abbreviation standing for 'On My Ass Tonight' used generally by gays and them guys who walk around with their hips wiggling (Dale Winton).
It is important for any straight guy to never mention these words in or around the company of CMOD'ing, straight as a round-about gay guy, or whilst serving a sustained amount of time jail (especially when near one of the big butch black guys); because if you do, they may get the wrong end of the stick - inevitably getting your ass put on the wrong end of the stick..
Ben: Sup, wanna cum OMAT?
Dwain: Do you even have to ask?
Ben: Good point, i'll go get the cage ready