bum bubble 

A bum bubble generally occurs when you're about to fart; as the gass being released is about to exit your anus, a bubble is created. When the bubble remains in your anus, and fails to be pushed out, it is known as a bum bubble; however, it can sometimes be mistaken for a sweaty anus.

stephen - whats up josh st. G, you look kinda funny

josh st. g - ya i've had this bum bubble stuck in my anus for hours and it's starting to really chafe, i even saw a little bit of blood squirt out, i'm hoping when i shit it'll pop

stephen - those sick bum bubbles

bum bubble by Stephen the Anus Man May 30, 2006

Bubble bum

Other meth addicts that come around just to smoke your bubble but never have any drugs or money of thier own.

Hide your shit here comes another bubble bum.

Bubble bum by Phantasmaddiction November 1, 2015

bubble-gum-by-the-bum 

A woman's labia. Self-explanatory.

All I wanna do,
Is chew, chew, chew,
On her bubble-gum-by-the-bum

bubble-gum-by-the-bum by Robots With Lasers February 14, 2009

Bubblegum bum 

A bum on a girl that is out of this world

All I can think about is her nice bubblegum bum

Bubblegum bum by Senators26 March 31, 2016