The slouch one gets after excessive masturbation.
Steve tried to hide the fact he was touching himself in the Wendy's bathroom, but came out with a serious case of monkey shoulder.
by MacDaddy6.9 November 12, 2017
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The invisible monkeys that live on either of one's shoulders.
Tell your shoulder monkey to stop throwing feces at me!
by beepers872 December 17, 2007
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