EminemIt might not be a good idea to get on the wrong side of Eminem.

With his habit of using his song lyrics to get back at people, you want to watch your step.

Someone should have warned Mariah Carey.

Mariah recently dressed up as a bad-boy rapper for the video of her latest single Obsessed, and looked suspiciously like she was taking the mick out of Eminem.

And now Em's seemingly hitting back with a song of his own - appropriately called The Warning.Mariah Carey in her vid

In the explicit lyrics he says he's angry because a certain woman apparently denied dating him - and mentions the name Mariah several times.

"Only reason I dissed you in the first place is because you denied seeing me."

The no-holds-barred lyrics continue: "Oh gee, is that supposed to be me in the video with the goatee?

"Wow Mariah, I didn't expect her to go balls out."

Unfortunately, we can't print the rest of the lyrics because they're just too rude.

But his song is sure to wind up Mariah and her hubby, Nick Cannon.

Eminem talks about having "dirt" on the woman and tells a man called Nick to "tell her to shut her mouth and then I'll leave her alone."

At one point he also says: "As long as the song's getting airplay I'm dissing you."

Oh dear.

Knowing how popular Mariah Carey and Eminem's songs are, this one could run and run...

Check out other celeb feuds in our gallery below.