Top definition
(named after Sean "the Muscle Shark" Sherk, UFC champ)
1: An incredibly buff individual who one would suspect of using steroids.
2:Refering to ones self as buff, or attempting to get buff
1: man! arnold used to be a muscle shark back in the day

2:im gonna go get my muscle shark on at the gym!
by Blacklabelmichael May 15, 2007
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