Slang rock 

(v), alt: slang rocks, sling rock, sling rocks,
To sling (or slang) i.e. sell or distribute;

Rocks (or rock), crack cocaine.

To sling rock means specifically to be a crack dealer.

"What's yo trap nigga?"
"I slang rock."
"hood as fuck, my nigga."

Slang rock by Uncommon Sense February 28, 2015

slang-rock 

use coke or cocaine

Yo u slang-rock?

slang-rock by Ripper June 21, 2003

Slang Rocks 

A Male\Female sells drugs to other people

(in a whisper voice) "Sir.... Do you happen to slang rocks?"

Slang Rocks by Ladiesman2177 June 23, 2009

sling rocks 

Deal crack.

You be slingin' rocks?

sling rocks by nokianinja October 7, 2002