50cent arrested for saying Motherf**ker in the Carribean

50 Cent was arrested in St. Kitts in the Caribbean Saturday night for using a word that's apparently illegal there ... 'motherf*****.

TMZ reports that 50 had been warned not to use profanity during his performance in front of 40,000 people.

We're told the DJ didn't have a clean version of his set, and 50 didn't pull the mic away from his mouth when he roared, "motherf*****" ... and that was enough to get him arrested.

Cops showed up after the performance and took 50 to the station, where he was booked for using profanity in public.  It's a minor offense, but he has to stick around until Monday when he'll go to court and pay a fine.

The same thing happened to DMX in 2003.

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