1 definition by Riki Mats

Top Definition
A slackphuck is a person who does not preform well while having sex; generally talking about being involved in or being a part of the actually act.
"why are you just laying there...?"
"why am I always on top? do something..."
"did you fall alseep?, you slackphuck..."
by Riki Mats April 07, 2010

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