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Celebrating an achievement in a manner that is disproportionate to the deed. Excessive self-congratulations that is most often seen in sporting events, but occurs everywhere.
Her fist pump through the windshield after making every green light on the way to the movie was propjack karma.

The bicep show after his team got their only first down of the first half was pure propjack.
by mcdede December 29, 2013
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