When a wannabe rastafarian shows up at everyone Penn Stateparty possible, but nobody knows who he is or what he's doing there. You dislike him immensley, however always love to have a drunk conversation with him by the keg.
Hey, Shady McJackson is here!
Who?
The smelly guy with dreadlocks who never pays for a beer but always has a cup filled by the keg.
By definition the sickest sexual act in mankind's wide repertoire of deviance. Involves any sort of sharp objects, though most commonly scissors, rubberbands, and a pineapple. Note that one's whole body should be disinffected before attempting a mackson.