Alley ___

OOP

This exclamation might be heard after a mistake in a casual basketball game or while playing a classic arcade title.

Alley ___" is a playful reference to the phrase "alley-oop," a term from basketball where one player throws the ball near the hoop for a teammate to dunk. The clue drops the "alley" part and leaves you with "oop" as the answer. It’s a straightforward split of a well-known sports phrase, relying on the solver recognizing the familiar call.