shit-eating grin

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shit-eating grin

rude slang A facial expression denoting arrogance, smugness, or self-satisfaction. Primarily heard in US. I really wanted to wipe that shit-eating grin off his face after he won the poker game.
See also: grin
References in periodicals archive ?
Frank Stella sports a shit-eating grin. The successful painter, cigar in hand, is revealed to be nearly toothless; under Arbus's dangerous lens, his smile becomes vampyric, grotesque.