To express approval or enthusiasm for something
Q: Dewd, did you see that footage of the new Vivid pr0n star Billy had up on his PC during social studies class?

A: I was yayin' it br0

Also:

Billy, I'm yaying the pr0n you shared with us during class...
by Lazy Slacker July 31, 2009
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When your high on cocaine and drunk from alcohol.
I've consumed half a bottle of whiskey and sniffed some cocaine so I guess I'm yayin
by CandyKush November 30, 2011
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to be completely intoxicated, often combination of drunk and high. Derived from being obliterated (drunk) and high (yayed).
ya I was yayinated last night
by The Bandito Taquito October 22, 2013
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