50 Cent has been accused of defaming a friend of Jam Master Jay in his new biopic of the slain producer.
Fiddy is producing a new movie about the life of the former RUN-D.M.C. DJ, who was shot dead in New York in 2002, aged 37.
Randy Allen, a former pal of Jay - real name Jason Mizell - has discovered he features unfavourably in the film, and has lashed out at 50 Cent in a new rap release.
Speaking to reporters, Allen also attacks Fiddy for failing to consult him about his portrayal in the movie, saying, "He's stepping out of the circle of what he knows... Why would you go... and promote something... without even talking to me about it and finding out if that's what it is? Anybody doing that is (a) p**sy."
Referring to his new track P**sy Man, released under his rap name MDR, he adds, "I shouldn't have to go through all that. So why not just put it on a song and express how I feel? Yo n**ga, wake up. What you doing is some p**sy s**t."
Jam Master Jay's murder remains unsolved and is still being investigated by the New York Police Department.