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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."
Guycep by Tigger's Back March 18, 2010

Guyception 

A tactic used by men to acknowledge and call attention to an attractive female, while appearing to find them disgusting or unclassy. It is usually employed around the guy's female significant other, or female friends, or even superiors so that he may admit to noticing a certain feature of the woman without his company passing judgement upon him. The guy will mention the feature in a sour tone, denoting how 'slutty' or 'skimpy' or 'huge' that feature might be. The man will often tend to rant about the aspect to clearly establish his distaste for it. Often followed up with a reassuring compliment to the woman / women around him.
"Honey, did you see that woman that just walked past us?"
"What, the one with the obvious boob job?"
"You can tell?"
"Please! Those things went from here to Friday. They were way too firm and high for breasts that size... Clearly not natural. Don't ever think about doing that to your body, babe. You're beautiful."
"Aww... You're so sweet~!"

"Have you seen Mark lately?"
"He's always hanging out with the chicks in his course, right?"
"Yeah! And his girlfriend doesn't seem to give a damn."
"That's Mark... He settles her anytime she brings those girls up. He's a real master of guyception."
Guyception by BigHarv January 9, 2009
When a girl has jacked arms, similar to a man's.
That girl has wicked guyceps!
Guyceps by ti6969 March 3, 2010

Working out my Guycep 

verb

Another fancier, more acceptable way to say that your masturbating
Jeff: What are you doing later Tom?
Tom: Im working out my guycep later.
Jeff: What gym do you go to?
Tom: My computer chair.