Noun
The lower part of the buttocks, especially as revealed by certain clothing such as skimpy shorts.
Usage- Canada
- US usage
- Informal
- Related words
- Examples
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Strengthens and slims your underbutt!
More examples (1)
Most of the time it's just like any other dressing room, and I try not to cry when I'm forced to confront my underbutt under the bluish fluorescent light the three-way mirror.
My struggle is with my underbutt. Not my butt, but my underbutt, that chunk between the butt and the legs.