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1.
The extreme pain due to a high-velocity impact between the male scrotum and the inner thigh flab. This usually occurs when playing intense sports such as ping-pong, or doing jumping jacks. The resulting sound is a high-pitched, incredibly loud slapping noise.
Person 1: Owww, I just had a slappy joe!

Person 2: ....I am so sorry. Here, take a Vicodin.
by SlappyJoesHurt December 27, 2011