A GBP(Ghetto Black People or Person) is one or a few of African American descent, belonging to specific subculture deemed "ghetto" or "morally inept" or "ratchet". One Might assume this person to talk loudly and with no ability to comply with societal standards.
"What is that noise, even?"
"It's all of them GBPz up in dis mug, straight thinking they thuggin' with all of their doin' extra and what not, Zamm (Damn) Gall!"
"Girl you already know!"
"I am so done with all of these GBPz!"
*Storms out twerking*