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Under-Bum

An area located beneath the Buttocks, If ticklish it is open to the act of Under-Bumming, where a second party uses a hand to squeeze the area as a method of acute torture.

Usually not to extract information, But to extract uncontrollable laughter and strange noises from the Under-Bumee.

Person 1 : I'm bored, I'm going to Under-bum you!

Person 2 : NO! I cant take another Under-bumming!

by Thomasjeffy December 9, 2014

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