Underbutt

noun, slang

noun, slang ·Uncommon ·College level

Definitions

Noun
  1. 1
    The lower part of the buttocks, especially as revealed by certain clothing such as skimpy shorts. Canada, US, informal

    "Strengthens and slims your underbutt!"

Synonyms

All synonyms
underbum

Example

More examples

"Strengthens and slims your underbutt!"

Etymology

From under- + butt, by analogy with underboob.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.