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One who gets very angry and belligerent without cause. It is often used in relation to alcohol consumption.

While some people argue that the term originated in Western Massachusetts, others have traced its genesis to Brown University.

The general consensus is that PChoi has no literal etymology, it might be an amalgam of sounds one might make while shooting at another person with proverbial bullets, or insults.
Did you hear Mark last night? He was completely PChoi! His rage was off the charts.
by winbounce February 21, 2009
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