Go You Athletic Team

Short for GYAT, a saying that is used by coaches, teachers, and more to give motivation to a team playing a game, such as basketball.

Bob: "Hey coach, did you know that GYAT means "Go You Athletic Team"? You should tell that to the girls team playing basketball over there for motivation!"
Coach: "Alrighty!"
Coach: "GYAT! GYAT! GYAAAAAAATTTT!"