a shit-eating grin

a shit-eating grin

  (American taboo)
a look of extreme satisfaction on someone's face that is annoying to other people who are less happy Ever since she heard they'd won she's been sitting there with that shit-eating grin on her face.
See also: grin
References in periodicals archive ?
Randy was wearing a t-shirt denoting Asshole University enrollment and a shit-eating grin.