Rapper Xzibit Says: 'Planking' Is RACIST

Xzibit is leading a new charge AGAINST "planking" ... claiming the practice has RACIST roots.

Xzibit took to his Twitter recently, claiming, "Planking is THE dumbest sh*t ever. Planking was a way to transport slaves on ships during the slave trade, its not funny. Educate yourselves."

The rapper adds, "Dont get it twisted. I care less where your dumb asses lay face down and take pictures of the sh*t, I'm just telling you where it came from."

It's all probably news to Katy Perry, Demi Moore, Rosario Dawson, Chris Brown, and Justin Bieber who have ALL posted pics of themselves online looking board.