The girlgoyle is the profoundly ugly chick that hangs around with the really hot girl that you are trying to hit on. In order for a successful coming-on attempt, the girlgoyle must be neutralized. This is where one of your buddies must "take one for the team" and go flirt with the girlgoyle, leaving the hot girl available for flirting purposes.
The girl was beautiful, unfortunately her friend was a complete girlgoyle.
by john February 07, 2005