When a man cums into a girl's mouth, then, like toothpaste, swishes and gargles the cum before spitting it out, usually onto or into the man.
Dudebro #1: Dude I heard you smashed Stacy last week, that girl's a freak bro!
Dudebro #2: You aren't kidding, she was gargling gravy! My nut didn't taste half bad too.
Dudebro #1: Bet? Lemme get a taste!
When one ejaculates on the rear end of their partner and then proceeds to spank their rear end forgetting that they had ejaculated on it. In turn, spankin' gravy.
I can't believe I spanked my gravy last night!
We should spank some gravy tonight!
I'll definitely be spankin' gravy tonight.
Have you ever spanked gravy?
When are you going to let me spank my gravy?
I accidentally just spanked my gravy!
I can't believe mom didn't hear us spankin gravy last night!
I got that bitch looking like Slimer, with my ghost gravy all up on her.
Gravy Sweater, N. (Grey-vee swë tur) One who sweats gravy from the vajieen
That misrable cow was such a corpulant tragedy that were you brave enough to venture forth betwixt her undulating thighs and pendulus belly you would discover such a slovenly unkempt quagmire of hairy smegmated folds that the mucosal excreations we're remeniscent of brown gravy one could only describe the horrific seen as being a Gravy Sweater.