slang pastence of CRANK, to crank an engine up is to you motivate it and energize it. Until it finally spins on its own, thus it is CRUNK!
Apply this to a thing or person and you see what i mean.
Crank has also been used to describe a methamphetamine drug. SO some might think you are saying that you are hopped up on crank.
That party was so crunk it lasted for days.
This music started out slow but now its CRUNK!