noun
tush
TUSH/tʊʃ/
The buttocks.
The man rests an open hand on his clothed tush.

Etymology
The connection is spatial: 'beneath' supplied a name for the lower rear part of the body. Tush is a shortened, informal version of that name.
In context
a dead rattlesnake bit me on the butt. >> Rattlesnake bit me right on my tush.
More examples
- The toddler lands on his tush and starts laughing.
- These jeans fit snugly around my tush.
- She brushes the sand off her tush.
Forms
tush · tushes