The slang term for when a person becomes very angry and has surpassed the level of "apeshit"
Bob: Yo, that guy just stole your car! go apeshit on him!

Andrew: No, it's more serious, i'm gonna go yeeshit on him!
by wtflawlsauce September 17, 2008
Top Definition
a word that means like bullsh*t often used in california
He be on dat Yee Shit
by cellygothisfame January 10, 2009
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