A child's word or informal slang for someone's bottom or buttocks.
Origin uncertain, possibly from Yiddish 'tuchis' or 'toches,' which may derive from Hebrew 'tachath' meaning 'underneath.' It entered English as baby-talk or humorous slang.
Different cultures have dozens of slang words for the same body part—some are Yiddish-influenced (tushy, tuchis), some from old English (bum, bottom), and some are pure invention (booty)—linguistic variety at its finest!
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