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1.
The spare forgotten change like nickels and dimes that is used in the purchase of crack cocaine.

You could also use the term to describe change(coin money) in general for mere comic relief.
Bum: "Spare some change?"
Business man: "I'm sorry I don't have any Crack change for you sir".

-"With all this crack change I could buy a sandwich!"
by Dev86 July 07, 2008