A term used for a person who is a hardcore gangsta at heart, or whos name begins with teh letter "G". On the contrary, depending on the context, a term for a poser trying to rep something he aint got, who is usually white.
"Fuck yo, dont let that G-Mizzle play you out"
"Yo G-Mizzle! Shit man, holla at yo boy!"
"Im the old-school G-Mizzle from Briarwood, don't mess"