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A female who has highly defined biceps likened to that of males. Said female most likely also has a very defined six-pack, more defined than your boyfriend's in fact.

It is often the sign of a lesbian, any woman who practices Wing Chun, or Ms. Universe.
Mike: Man, check out that girl's guyceps!
David: I now know why they call it Manchester.

"Hey, did you see how hot that girl was?"

"Dude, she's tots a lesbo."

"Just cause her name is Leslie---"

"Duuuuude, guyceps. DUH."
by Tigger's Back March 18, 2010
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Jun 24 Word of the Day
An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.

Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.
Sarah: 'OMG Susan, I can't believe you are wearing the same skirt as yesterday. Oh, and by the way, EVERYONE knows what you did with Kevin on the weekend. Plus you look a little fat, are you retaining water?'

Susan: 'LEAVE BRITNEY ALONE!'
by Billy Chickenhole September 15, 2007
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2
a muscle that grows exclusively on the male human, aka "the penis"
Dave: Man your forearms are huge!
Matt: Yeah, been working out the Guy-cep lately
Dave: Nice!
by Edvardio May 22, 2008
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