Meanings
plural underbutts
- CanadaUSinformalThe lower part of the buttocks, especially as revealed by certain clothing such as skimpy shorts.
Strengthens and slims your underbutt!
2009, Karon Karter, The Ultimate Body Shaping Bible, page 1162 more examples
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.
2010, Shauna Niequist, Bittersweet: Thoughts on Change, Grace, and Learning the Hard Way, page 92My struggle is with my underbutt. Not my butt, but my underbutt, that chunk between the butt and the legs.
2017, Beth Behrs, The Total ME-Tox: How to Ditch Your Diet, Move Your Body & Love Your Life, unnumbered pageSynonyms: underbum
Synonyms & antonyms
nounThe lower part of the buttocks, especially as revealed by certain clothing such as skimpy shorts.
Origin
From under- + butt, by analogy with underboob.
Full word history & related roots →Cite this entry
underbutt. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/underbutt
“underbutt.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/underbutt. Accessed November 3, 2026.
WatkinsX Dictionary, s.v. “underbutt,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/underbutt.
Source: underbutt on Wiktionary, CC BY-SA 4.0.