So wipe the smile on your grill off

from Nicki Minaj (Ft. Eminem) – Roman's Revenge Lyrics on Rap Genius

Meaning

Again with the auto stuff! “Grill” here means “face”, but also refers to the grille of a car. In addition, it sets up the food imagery in the “Happy Meal” line to follow — as in the kind of grill you cook burgers on. Good triple entendre, Marshall!

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