keister

American  

[kee-ster] / ˈki stər /

Or keester

noun

Slang.

1. the buttocks; rump.

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keister British  

/ ˈkiːstə /

noun

1. the rump; buttocks

2. a suitcase, trunk, or box

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Etymology

Origin of keister

1880–85; earlier, as underworld argot, handbag, suitcase, safe; of obscure origin, but words meaning “chest, box” are frequently adduced as sources, e.g., kist, German Kiste, Yiddish kestl, etc.

Example Sentences

There’s no more motivating word for us than “no” — it lights a fire under our keisters.

From Washington Post

So a few weeks ago when the decorated folk rocker mentioned she had some “wild surprises” in store for her second annual Gorge Amphitheatre takeover, we assumed she wasn’t just blowing smoke up our keisters.

From Seattle Times

I watched Ted Leonsis, just in case he slipped on his keister.

From Washington Post

“There were a few guys who, no matter what you did, you were wrong. But I didn’t let them call me names. I would run their little keisters.”

From Seattle Times

“Oh, here’s another important number: 100%, which is how much of that he just yanked out of his keister,” Colbert interjected.

From The Guardian