A comical way to describe a woman, as they have a "bum" both at the front and rear.
as used by Jimmy Carr
stopping in with the double bum tonight
by Marc Cooper October 27, 2007
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When man is getting done in the ass by another man and, selflessly, reaches back around the donator of the cock and fingers his bum hole.
Zech: Dude, what did you just do to my ass? It was beautiful.

Jackson: While you were plowing my pooper I reached back and took care of you. We Double Bummed!
by Dabawss May 10, 2014
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This phenomenon occurs when a man or woman has a beer belly and s/he wears a belt in the middle creating a bum-like effect.

See photo: This phenomenon occurs when a man or woman has a beer belly and s/he wears a belt in the middle creating a bum-like effect.
Amaya: Ashleigh, do you think this belt looks nice?
Ashleigh: nah. I think it gives you double bum tum
by No dbt August 16, 2015
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The action that occurs when one bum touches another, creating a double bum.
See those guys over there, they're doing the double bum.
by Beefanny February 14, 2018
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