Top Definition
The part of the buttocks which touch the surface you are sitting on; where the buttocks meet the thighs
The Buttom is where the buttocks meet the thighs, the bottom of the buttocks.
by Mu Shu Hugh April 16, 2009
1 more definition
1. Ones butt, or bottom. More polite than butt, but more rude than bottom.
2. An effing idiot or jerk. More mature than saying butt head.
1. I fell on my buttom and now it hurts.
2. Dude, your such a buttom.
by Black X February 19, 2009

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