Top Definition
One who is unreasonably irritated, or get Crazy eyed at seemingly random events. A strange and coo-coo person.
Mj: Hey man, did you see 'Paladenz' on WoW last night?

Michelle: Naw, last i heard, he went yatesy, blew up, and left.

Mj: Bummer.. we still up for the raid tonight?
by Sonofalitch February 22, 2014
1 more definition
Suddenly becoming unreasonable, agitated or slightly insane.
David went a bit yatesy when his room mate ate the last of the bacon.
by Foulmood February 22, 2014

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