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.
Being real great at Yahtzee, and die related gambling games. Also being able to cut holes in other kids potato sacks so they lose at that game as well.
"Charles....that's the third time you won Yahtzee....You have mastered yahtomy'
Example 2
"Ha! Ricky just cutholes in all the other boy's sacks. They gonna trip real bad"