A dangerous drug that's a freebase form of cocaine that can be smoked. Nicknames include rock, work, hard, iron, cavvy, base, or just crack. It's said to be the most addictive form of cocaine there is. It offers a short (but intense high).
Sara: "Did you hear that Rowan tried crack cocaine because his friends were doing it?"
Veronika: "Yeah man, wasn't surprised."
a figurative drug (in the same way as imbecilium) that makes the user act like an asshole or even a douchebag.
Whatever you're on to cause you to make these "jokes" and act like a douchebag when you're usually fun to be around must be some pretty powerful variant of imbecilium or ass-crack cocaine