Definition

noun

A type of pastry that consists of an outer crust and a filling.
“The family had steak and kidney pie for dinner and cherry pie for dessert.”
Any of various other, non-pastry dishes that maintain the general concept of a shell with a filling.
“Shepherd's pie is made of mince covered with mashed potato.”
(Northeastern US) A pizza.

verb

To hit in the face with a pie, either for comic effect or as a means of protest (see also pieing).
“I'd like to see someone pie the chairman of the board.”
To go around (a corner) in a guarded manner.
(of printing types) To reduce to confusion; to jumble.