noun
keister
noun
1
A person's buttocks (informal).
"He slipped on the ice and landed right on his keister."
2
A suitcase, satchel, or (in older slang) a safe or strongbox.
"The old-time con man carried his tools in a battered keister."
How to Use Keister
Learner’s notesIn plain EnglishInformal American slang for the buttocks, or an older slang term for a case or safe.
When to use it
Informal, mainly American.
Word Forms
keistered past tense, keisters plural, Keisters plural, keisters singular
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Etymology
Origin uncertain; first recorded in 19th-century criminal slang meaning a burglar's toolbox, possibly related to the German/Yiddish word Kiste, meaning "box" or "case".