A person who uses illegal controlled substance routinely that can be.found in the wee hours of the morning seeking drugs. An addict out at the crack of dawn.
Me: damn bru what is that chick doing up so damn early for?
You: man that is a doped up crackadon. She's always out here at these hours looking for crumbs.
Something, usually food, that is so irresistible that it overcomes will power to resist it and has seemingly addictive properties similar to the drug crack.