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1.
Anyone name Joe that has the potential to make a situation that much better whether that is taking a bad situation to a good or a good situation to great. Hence the Joe effect.
Johnny: Dawg this party is dull.. I hope Joe shows up... (30mins later)

Johnny: Dawg this party is off the chain since Joe showed up
Jack: man that's called the Joe effect
by America1 January 09, 2013
27 1