To neglect wearing underwear, or in the right situations wearing nothing at all waist down.

Usually used to make the lack of wearing undergarments sound like its own pair undergarments.
I would slip out of my clothes to go swimming, but I'm wearing my bare bottoms.

She slept in bed with her bear bottoms on.
by Anon19374 June 7, 2018
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An activity where two men stand side by side, and take turns slapping each other on the ass as hard as possible.
Russ: You are an asshole!
Chris: Oh yeah? Well, I challenge you to a bare bottom slap-off!
Russ: It's on like donkey kong!
Chris: Let me get on my ass-less chaps first!
by Der Red Baron September 1, 2006
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An activity where two naked or partially clothed men stand side by side, and take turns slapping each other on the ass as hard as possible.
Russ: You are an asshole!
Chris: Oh yeah? Well, I challenge you to a bare bottom slap-off!
Russ: It's on like donkey kong!
Chris: Fuck yeah! Let me get on my ass-less chaps first!
by Der Red Baron September 1, 2006
Get the bare bottom slap-off mug.