keister
noun/ˈkiːstə(r)/
/ˈkiːstər/
(North American English, informal)- the part of the body that you sit on synonym bottom
- I’m not going to freeze my keister off out there.
Word Originlate 19th cent. (originally referring to a suitcase or box used for carrying possessions or merchandise): of unknown origin.
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keister