pie-eating grin

pie-eating grin

A smug, self-satisfied, or overly pleased smile, especially one that (intentionally or unintentionally) irritates others. She's been walking around with that pie-eating grin on her face ever since she found out she got into Harvard.
See also: grin
References in periodicals archive ?
Lemmon's actor son Christopher recalled: "There's a picture of my father holding me up in a nappy and I've got a big pie-eating grin on my face.