The pool of semen that accumulates in one's navel following a vigorous round of masturbation. Conversely, the pool of semen that accumulates in one's partner's navel following either pulling-out during intercourse or practicing the 'on me not in me' method of safer sex/frottage/pregnancy prevention.
As they lay next to each other, spent from their lustful exertion, Bill began to dip his fingers in Mike's gravy crater, delivering their salty sweetness to his tongue. "Damn, I'm a good cook", he said with a wickedsmile.
Its that thing where you take leftover Thanksgiving turkey gravy and pour it on your dick and then a girl sucks it off while you whistle the Davey Crockett theme song.
Mike: What'd you do with your leftovers bro?
Ted: Gravy Crotchett
Mike: Nice dude
Bianca: Last night at this raging party Jordyn and I were dancing on the table and fell off.
Jordyn: Yea, I think my butt is going to have a pretty nice bruise on it.
Monica: Gravy, Y'all are crazy. *Rolls eyes*