A GBC or "gay, black, cripple" is an acronym used to describe a homosexual black man in a wheel chair. They are known for their jerry curls, large penises, spinner wheel chair rims, and shit eating grins.
They are also the worst hate crime victims. If you beat up a GBC you are committing a hate crime towards three different demographics. ULTIMATE hate crime.
I kicked that GBC right out his wheel chair and stomped his mouth 'cause it was the only thing that was still movin'! Talk shit now motha fucka!