Courtesy of jewschool:
"Crunk," writes Wikipedia, "is a specific type of hip hop music, based out of the southern United States, particularly Atlanta, Georgia." Popularized by the likes of artists such as Lil Jon, "The sound itself is a mix of repetitive chants and drum machine rhythms...The delivery of the lyrics, as with other Southern rap, is based on a rhythmic 'bounce' which is very effective in clubs"
"But according to one entry in the Urban Dictionary, the word "crunk" may actually have Yiddish origins:
[Crunk] in Yiddish means "sick," and was brought into the Southern Black vernacular through the presence of European Jewish immigrant shopkeepers in black neighborhoods in cities such as Atlanta.
Can be used in the sense of "messed up" as in "these forks are crunk," and spread to "messed up" as from controlled substances.