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keester

[kee-ster]
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noun Slang.
  1. keister.

keister

or kees·ter

[kee-ster]
noun Slang.
  1. the buttocks; rump.

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., kist1, German Kiste, Yiddish kestl, etc.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for keester

keister

keester

noun slang, mainly US
  1. the rump; buttocks
  2. a suitcase, trunk, or box

Word Origin

C20: of uncertain origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for keester

keister

n.

"buttocks," 1931, perhaps transferred from underworld meaning "safe, strongbox" (1914), earlier "a burglar's toolkit that can be locked" (1881); probably from British dialect kist (northern form of chest) or its German cognate Kiste "chest, box." The connection may be via pickpocket slang sense of "rear trouser pocket" (1930s).

Online Etymology Dictionary, © 2010 Douglas Harper