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keister

(slang, dated) A safe, a strongbox.

/kˈiɪstɝ/Documented since 1880sSilenthistoricalCurrent53 viewsLast reviewed Jun 29, 2026+ Add a definition
🗺️ Regional & Other
3 definitions
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Etymology timeline

Born ~1881 · 1 year of recorded use
1881Born2026: 1 citationToday, 2026

Definitions

#1·Apr 27, 2026

(slang, dated) A safe, a strongbox.

Heard in the wild
  • Stealing the show… and everyone was glad for it. 😉😌🥰 Great pic, amazing bum. Your keister is just as magnificent as the rest of you, my friend! 👌🫶

    Bluesky· May 2026
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#2·Apr 27, 2026

(slang) The anus or buttocks.

Origin: . Originally attested as a criminal cant word for "burglar's tool-box" in 1881. In the 20th century a clutch of criminal slang meanings are mentioned, including "safe, strongbox". "Tripe and keister" had been the phrase for a conman's or a pitchman's display case on a tripod. A likely origin is the word Kiste, which means a box or case, in both German and Yiddish. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
For parents

"keister" means: The anus or buttocks.. This is informal slang, common in casual speech, texting and social media, but not appropriate for school work, applications or professional settings. There is no real cause for concern in itself; it is everyday peer vocabulary. If your child uses it, a light comment about audience and register is usually enough — no need to escalate. Context, more than the word, tells you whether to follow up.

For ESL learners

"keister" means: The anus or buttocks.. Register: informal slang, fine in casual conversation, texting and social media but not in academic essays, business writing or formal speech. A common non-native mistake is to use the word in the wrong register, or to assume one fixed meaning when it is actually polysemous; always check the surrounding register and the audience before producing it yourself. In formal writing, prefer a neutral synonym or a short descriptive phrase, and use this word only when you have heard or read it being used naturally in a comparable context.

Cluster: anatomy
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#3·Apr 27, 2026

(slang) A suitcase or satchel.

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