Kool-Aid smile

English

Etymology

From the wide smile of the character used to advertise the drink.

Noun

Kool-Aid smile (plural Kool-Aid smiles)

1. (US, idiomatic, informal) A large, beaming smile.
   • 2007, Michele A. Fletcher, Charge It to the Game, page 116:

     "We in E," they said in unison as big Kool-Aid smiles popped up on everybody's faces.