(North America, informal) The lower part of the buttocks, especially as revealed by certain clothing such as skimpy shorts.
No comments yet — say something.
Add your own interpretation of "underbutt".
The aesthetic vocabulary of how people dress now — quiet luxury, coquette, mob wife, coastal grandmother, Y2K core, and every "-core" that came after.
See all Fashion & Lifestyle slang on Slangora.
Browse all slang words starting with U.