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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First Sargent's Time: (V.) Army. Milspeak for a unit of time, dependent upon the judgement, wisdom, capriciousness or stupidity of ..