GuyCo. 

A highly promoted and financed auto insurance company that cleverly lures the prospective customer to "check us out and save some money".

Have you checked out GuyCo for your automotive insurance needs? No.

GuyCo. by Annoyed viewer and/or listener January 27, 2004

Guyco 

A guy who is so hairy that he looks like he should be wearing and animal skin tunic and carrying a big wooden club like the cave men in the Geico commercials.

Look at that guyco wrestler on the other team,He looks like a woolly mammoth.

Guyco by wolfbait51 June 4, 2011

guydo 

A rarely used word to describe a male that fits the stereotype of a "guido."

Although attempts have been made to make this a popular word in urban culture, all have failed. It is a commonly held belief that this word is lame and an overall very unsuccessful attempt at a nickname.

Ok guydo.

guydo by TheMailmanDelivers June 16, 2010

guycon 

A guy that women look at as an unobtainable prize, that lucky ladies might happen to snag and wear on their arm like a bangle.

"OMG Jennifer! Look, it's Brad Pitt! I love his hot body! He's such a guycon!"

guycon by strykerhorse July 13, 2009

Guyo 

a term used among close friends to replace "dude"

Ian to the Squad:
"How are we, guyos?"

Guyo by whattoput August 8, 2016

gyco 

get your cock out

'wey get your cock out'

gyco by stevie baby February 9, 2003

GYCO 

To say to a female GYCO, means to have them show and/or fondle their cunt.

Oi woman, get your cunt out (GYCO)
or
Oi woman, GYCO.

GYCO by curtia August 2, 2006