Crack. Mixture of cocaine and baking soda. Final product is broken up into small cubes or "rocks" and smoked.
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Verb: To rock, (not cook crack cocaine, or any other meltable drug powder into solid-rock-like-balls-of-chemicals, but to play rock music, head bang, drink a lot of Jack Daniels and sleep with at least three groupies at once, scream really loud at the top of one's voice while other people slam their instruments in a rhythmic fashion and call it 'rock music', basically be really cool.). Present tense.