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Keister is informal American slang for your — the part of you that you sit on. It is cheeky and a little old-fashioned, the sort of word a parent or a comedian might use instead of ass or butt. It is not rude in a sharp way, but it is not polite either; you would not write it in a school paper. People say get off your keister meaning get up and do something. Though actually, the word did not start as a body word. In old criminal slang a keister was a box: a burglar's toolbox, a safe, or a pitchman's case on a stand. How a box-word became a bottom-word is not fully clear; a likely source is German and Kiste, meaning a box or case. The sitting-on meaning is the one you will hear now.
屁股（美式俚語，帶點老派、開玩笑的口吻）
組成The origin is uncertain. It probably comes from German and Yiddish Kiste, a box or case. It does not split into English pieces you can count on.
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Keistername
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A surname.
keisternoun
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slangThe anus or buttocks.
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datedslangA safe, a strongbox.
- ― " […] The four hundred's yours to take a keister for me. Any cash you find in the box is yours." ― "Four hundred, huh? Don't seem like much. Think there'd be anything in the keister?"
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slangA suitcase or satchel.
- Tripods, keister and loud talk don't make a pitchman any more than do fine feathers make fine birds.
- Sometimes Mama was too busy to make the daily rounds of the draws and pockets, in which case she gave us the keister — an old leather satchel used, in its better days to carry the baby's "didies" in — and sent us to bring in the eggs.
keisterverb
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slangTo conceal something in one's rectum.
- Quick, keister this pot before the cops get here.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。