A term highly used in the late 1980s and early 1990s during the crack-boom to describe an individual selling or in possession of crack rocks. Remnants of its lingo are still evident in hip-hop lyrics, etc.
"Yo. Hello. I be dat 'nigga'. 'Dey call me 'da Rock Slinga, cuz' I sell dat crack to all da bling-blingas."