Green’s Dictionary of Slang

rock v.4

(drugs) to make pure cocaine into crack cocaine.

[UK]N. Griffiths Stump 118: Rocked and bagged the coke from where-the-fuck found its way into the galleries across the city.
[US]UGK ‘Life Is 2009’ 🎵 I said fuck bein broke, if I gotta sell coke / I’ma rock the shit up.
1011 ‘No Hook’ 🎵 Any skeng on sale man cop it / Drop it, whip it and rock it.