keister

noun

keis·​ter ˈkē-stər 

ˈkī-

variants or less commonly keester

ˈkē-stər 

plural keisters also keesters

informal

: buttocks, rear end sense 2

… Borg took a spectacular dive, landing on his keister.

—Curry Kirkpatrick

Four hours ago I was freezing my keister in the wilderness. Now I'm browsing the entrees in a French-inspired restaurant.

—Andrew Nelson

"… a very easygoing guy with a finely honed intelligence, which I didn't realize until he whipped my keister in Trivial Pursuit."

—Kenneth Turan

Synonyms of keister

• bum
• cheeks
• seat
• tail
• rump
• butt

Examples of keister in a Sentence

he fell right on his keister in front of the whole crowd

Recent Examples on the Web

So what's the worst part of slogging your keister around? —Outside Online, 18 Feb. 2026

Rose is also perilously up her own keister. —Christopher Borrelli, Chicago Tribune, 13 Jan. 2026

Then there is little Point San Pablo Beach, with something rare in the Bay Area – water that doesn’t freeze your keister – with decent swimming at high tide. —John Metcalfe, Mercury News, 13 Aug. 2025

But once O’Connor put Harley on his keister, Game 3 was never the same. —Sean Keeler, Denver Post, 27 Apr. 2025

Speaking of siblings, throughout this episode Matty dodges calls from her sister Bitsy, and then in the final scene, while stoned off her keister, Matty comes home to find one of Bitsy’s better-than-you-might-expect sugar-free peach pies sitting on the counter. —Noel Murray, Vulture, 27 Feb. 2025

This mindset predictably glosses over the fact not all people can get off their keister and run errands like that. —Steven Aquino, Forbes, 21 Nov. 2024

Word History

Etymology

English slang keister satchel

First Known Use

circa 1930, in the meaning defined above