Cockroach

Definition:

In any type of sexual relationship, when you only hook up at night, after everything is done for the day. You come in late at night like a cockroach, and scurry out before dawn.

Exemplification of usage:

Me: Damn, I've rarely seen this guy during the daylight. I think he booty calls me late after the bar. Her: He's treating you like a damn cockroach.