Shit that real niggaz do, such as sellin' drugs, killin' other niggaz, fuckin' bitches and then neglectin' his kids, goin' to buy milk and never comin' back, smokin' weed, or eatin' a lot of chicken.
Alternative meaning: shit that comes out of a real nigga's intestine.
Used after someone does something which they think is great they may say "it's that real nigga shit". This word was created by Josh Tetteh after he got a fresh trim.