UrbanDictionary.com/crunk

"Crunk
adj. or v.
1. cool, hype, to be overly energetic and or combative. The word has origins in the southern urban culture, and has not been heard by northern ears until recently. Although it has just gotten popular the word has been used in Southern songs for years.
Crunk
n. A musical genre of hip hop formed and dominant in the Southern states, i.e. Alabama, Tennessee, Mississippi, Georgia, Arkansas, Florida, Texas, Louisiana,and the Carolinas. Made popular by the success of Lil Jon & the Eastside Boys, David Banner, Youngbloodz, Pastor Troy, Lil Scrappy, Trillville,etc. The music is loud and abrasive in nature, with bass heavy beats, and loud repetitive lyrics. The music is high energy and is usually heard as only club music.

i.e. Outkast's 1998 single 'Rosa Parks',
'Ah ha, hush that fuss
Everybody move to the back of the bus
Do you wanna bump and slump with us
We the type of people make the club get crunk'
Lil Jon's 'Put Yo Hood Up', 'Who you wit nigga? Who you wit nigga?
Who you wit get crunk, who you wit nigga?'"