Top Definition
The opposite of yay.
Jack: Oh my god I think I am about to win the lottery, just 1 more number!
Jill: Oh really?
Jack: Yiy, I didnt win.
by MaFi0s0 December 16, 2006
an expression of happiness or a verb for having a good time. something that a yiyster says.
Come yiy with me you beautiful yiyster babe.
by K Milt December 20, 2006
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