A girls vagina.
Jess: Look, if you're going to put it in the compartment, then everything stays in the compartment.
Robert: Meaning wherever your dick is when you start the action, thats where you skeet.
an apartment; specifically, an 'efficiency' or extremely small apartment.
i was b-b-banging peyton in my compartment, when her head began hitting the wall!
the hag in the compartment below, started banging on a pipe when we were vigorously 'socking it home' at 3A!!
got to get out of this compartment and get my 40 acres and a mule!