slanging rock 

To sell crack cocaine

popularized by the 1991 movie "new jack city"

Tyrone: "yo Jamal how you been getting money to buy all that new jewelry"?

Jamal: "I been slanging rock"

slanging rock by janin ting June 12, 2009

SLINGING ROCK 

Selling crack cocaine

SLINGING ROCK by Mark April 14, 2003

Slangin' Rocks 

Selling cocaine or crack but Slagin' alone means just 2 sell any other illegal drug

Did u hear that Derek got caught slangin' rocks and now he doing 4 years in jail

Slangin' Rocks by Dereksag13 February 25, 2007