Slang term for a person's buttocks or bottom.
From Yiddish 'keister' or 'kister,' possibly derived from German 'Kiste' meaning 'box' or 'suitcase.' The term entered American English in the early 20th century through Yiddish-speaking communities.
This is a great example of how Yiddish contributed vibrant, playful vocabulary to American English—words like 'keister,' 'schmo,' and 'kibitz' added colorful expressiveness that mainstream English didn't quite have.
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