I've explained it before in here somewhere, Crunk is a Southern (now universal) slang for Party term to anything Party related. Crunk music is Party themed subject matter, Lil Jon says Crunk Rap is similar to Punk Rock, Crunk music consists of Heavy Bass beats, alot of Chanting, Call and Response, and Mosh Pit style dancing.
I'd love to see the pit at a crunk show. I didn't know about that.
KRS-One best describes the rap/hip hop debate. Here is what he said during an interview I found on theonion.com :