Ludacris Sued Over ‘Sex Room’ — He Stole My Dirty Words!

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Ludacris straight jacked several lyrics for his hit song “Sex Room” — so says a rapper from Chicago who claims he”s the real author … and now he”s filed a lawsuit.

The rapper — a guy named Marvo — claims he concocted the original concept for “Sex Room” back in 2009 … a year before Luda released it with Trey Songz.

Marvo claims he”d been working with a producer named Kajun  — but the dude sold the song to Ludacris behind his back.

Marvo says Ludacris changed parts of the song … but released it with many of the original lyrics, including multiple lines written by Marvo — such as, “Welcome to my sex room” and “It”s a private party.”

Marvo says he hasn”t gotten a penny for his tune and is now suing Ludacris and Trey Songz for an unspecified amount of loot.

But we have to give credit where credit is due … there are a bunch of genius lyrics on “Sex Room” that Ludacris came up with himself … like, “Feelin” high but I”m hung real low / Lookin” sorta like a tripod.”

Calls to Ludacris” people were not returned.