What is Yacist?
1.
A person who practices a form of (harmless) racism against that sometimes obnoxious group of people known most commonly known as NY Yankees fans.
SF Giants Fan: "Dude, the Yankees suck."
NY Yankees Fan: "C'mon, Why you gotta be such a Yacist?"
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1.
An exclamation used to calm someone down when they are being overly obnoxious or excited about something stupid or insignificant, simila..