bum grease

The disgusting film of dirt or grease that bums leave behind after sleeping on train seats

Don't sit there, that dirty hobo left behind some bum grease!

bum grease by BbStarD June 18, 2011

Bum Grease

The product of swamp ass that collects at the top of your butt crack.

My terrible case of swamp ass left a bum grease stain on my underwear.

Bum Grease by Amber Adamson January 24, 2009

greasy bum sex 

for some one to have anal sex and the balls going up the arse are sweaty also shortened down to gbs

"oh fck yeah i just had greasy bum sex with my gf"

greasy bum sex by flibe September 22, 2006

Bumcrease 

Another word for "ass crack" usually said with a Jamaican accent.

Man 1: Oh no, I just sat in mud!
(Stands up)
Man 2(Jamaican accent): Aha! It lookes like you got shit all over your bumcrease!

Bumcrease by Luciashlo October 24, 2009