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Someone who arrives to an event last, and leaves first. Unlike the reputation of the Marines (First to show up, and last leave), Reverse Marines avoid unsavory events by coming late, and leaving early. Particularly applicable to:

-Sexual Encounters
Jeff: Hey man, did you even show up for class this morning?
RM: Yeah, I slept in but was too hungover to make it 'til 10. Decided to pull a Reverse Marine.

Ali: So did Chris ever show up last night?
Jen: He rolled in 2 hours after when he said he'd show up. He came after I went down on him, and then took off while I was in the bathroom!
Ali: I TOLD you he was a reverse marine!
by Jack Banalae September 02, 2010