The residue left over from smoking crack. Often scraped out of a pipe or bong and then smoked again for a very intense rush. Addicts resort to this once their supply and money has run out.

crack cocaine resin

when you're hungover as shit after a spending a night drunk as a skunk

The previous definition of cresin is very much in fact inaccurate. Cresin is a name given to a child of much talent and intelligence. Mothers name their child this to symbolize future success and drive for this child. Those name Cresin hold the upmost highest potential.