Sit-upon has two connected British meanings. As a colloquial noun it refers to the buttocks or backside — a coy euphemism for the part of the body you sit on. As a concrete object it can also mean a small portable cushion used for sitting on at outdoor events, sports matches, or scout activities. The euphemistic bodily sense is the better-known usage, typically deployed in humorous or prissy contexts to avoid saying 'bottom' or stronger alternatives.
She settled herself onto her camping sit-upon and watched the match with a thermos of tea.
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Small, portable cushion for sitting on.
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(British, colloquial) Buttocks, bottom.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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