Hot 97 is a New York based rap/r&b radio station that seemingly has a weekly competition where females compete by smacking each other until they start bleeding, give up or by the “judge’s verdict”.
Read the small article at Stress.no (norwegian).

Direct link to the movie is here: Smackfest
(Warning: not suitable for everybody)

UPDATE: Smackfest is illegal in the state of New York, and was therefor actually stopped almost two months ago… who said news comes fast to Australia? =)
Anyway, lots of articles about it on the web, for example New York Post.