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MJFin is when a person u know is uncontrollably shaking becus either he or she is nervous or theyre just wierd. MJF clearly stands for michael jay fox. its pretty fucked up . but wutever
me: Angie ur MJFin like ma balls.
Angie: < dead cus she ended up having a seizure
by I'm that nigga in the alley January 31, 2009
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