Top definition
A cheer of excitement of victory; partuclarly popular among high school female athletes and occasionally male athletes as well. Can be added to words to form new words (Yahtotron, Yahtobot, etc.). Use of it can sometimes get out of hand though.

Also means 'blue' in the Sioux language.
Girl 1: "We just won the game!"

Girl 2: "Yahto!!!"

Girl 1: "I got an A on y spanish test!"

Girl 2: "Yahto!"

Girl 1: "Let's go get shitfaced!"

Girl 2: "Yahto!"
by Memobile_N May 20, 2010
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