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1.
Crack cocaine mixed with black tar heroin. The crack is melted in a spoonful of water, and when it becomes oily a piece of heroin is added, then mixed in with the coke as it hardens. The end result is "Chocolate Rock".
Smoking this chocolate rock is just as good as slamming a speedball.
by psygirl604 August 16, 2008
 
2.
A synonym for feces or defecate.
"Dude, you just stepped in a dog's chocolate rocks"
by ilovemycatalex August 31, 2011