Rusty Slot
While taking a chick doggie style, you slide your viened and swollen blood bomber and jam it up her crapper. After furiously pounding the skank's ass, you take your poop covered hammer and stick back in her greasy box. The sticky brownish film all along her vaginal opening resembles a Rusty Slot.
"Your sister didn't deserve much more than the Rusty Slot I gave her."
rusty coin slot
result of one who has not mastered the art of wiping ones own ass correctly; characterized by an ass crack full of shit stains; often results in skid marked under garments, rancid fecal odor and an itchy booty hole
When defecating, I prefer to clean me crap crack with wet wipes, this - in turn - will alleviate me from sporting a rusty coin slot....which, I believe is generally frowned upon