Short for "Eat my ass."
Pat: I can't believe you're not coming to the strip club with us tonight...
Brad: I can't, I have a huge cardio exam I have to study for.
Pat: EMA! That excuse is not good enough.
Brad: I can't, I have a huge cardio exam I have to study for.
Pat: EMA! That excuse is not good enough.
by LPdoc January 30, 2011