underbutt

English

Etymology

under- +‎ butt

Noun

underbutt (plural underbutts)

1. (US, informal) The lower part of the buttocks, as revealed by certain clothing such as skimpy shorts.
   • 2010, Shauna Niequist, Bittersweet:

     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 in the three-way mirror.

See also

• muffin top