To describe someone who is EXTREMELY and UNBELIEVABLY unpleasant. Most commonly used when no possible words can come to mind to describe either a person or situation. The equivalence of being a douche-bag multiplied by at least 50.
"DUDE! You just fucking puked all over me you fucking cunt-muscle!!!"

In situational terms one may be "cunt-muscled".
by Steel843Curtain November 7, 2008
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A muscle in the vagina, used to call someone when they are a complete homo.
Robert: I like long walks on the beach where I feel close to nature
Anthony: You are such a cunt-muscle
by Anthony Paolillo May 14, 2007
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Either a pantie thief or a person who thinks they are all knowing. Even when Proved Wrong. Also could be an unexpected/unannounced visitor Or children who frequently shit their pants.
I cannot believe that regurgitated Cunt Muscle Knocked on my door without warning, Stole my undies, and shat his pants! What a fucking queef!
by Jonny Obese October 18, 2009
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Derogatory term for a homosexual, the anus of a homosexual male.
He stuck his penis in his partners muscle cunt.
by KillaKirby May 10, 2010
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