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A completely useless person.

Given that a mule is unable to procreate, its penis is a waste of flesh.
HR messed up my paycheck again. What a bunch of mule dicks.
by nautonnier April 28, 2009
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When a well endowed male is able to have sex in the doggystyle position and loosens up the female vaginally or anally he is able to insert most if not all of his penis into her orfice that he is penetrating
"He was really mule dicking her "
by JEddieMacJr February 05, 2017
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