shit-eating grins

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Definition of shit-eating grins in English English dictionary

shit-eating grins
plural form of shit-eating grin
shit-eating grin
A broad smile indicating self-awareness that may suggest self-satisfaction, smugness, discomfort, or embarrassment

He was at the wheel of his brand-new 1965 GTO, top down, wearing a super-sized shit-eating grin on his face.