underbum
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
The lower part of the buttocks, as revealed by certain clothing such as skimpy shorts.
Register: slang
Examples
Now, no one is pretending this is an easy look to pull off, but whereas the whale tail was shaming because it was a fail – the byproduct of you scrabbling in the bottom of your bag for your Oyster card – the underbum is at least bold and brazen, in a lollipoppy, Katy Perry or Rihanna kind of a way.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “underbum” mean?
The lower part of the buttocks, as revealed by certain clothing such as skimpy shorts.
Is “underbum” formal or informal?
underbum is generally slang.