Rap vs Boxing: 'Nelly Stole Your Chic' -50cent Trash Mayweather

50 Cent has been harassing boxer, Floyd Mayweather over the fact Nelly is dating Floyd's ex-GF and claiming Nelly really took his lady.

For the record, 50cent and Floyd used to be close friends but they had a bad falling out and now the rapper is trashing his former friend all over social media.

Nelly and Mayweather's Ex GF

It started when 50 posted a pic of Floyd's ex-GF Shantel Jackson -- writing, "CHAMP I ain't gonna lie this motherf**ker bad. You need to start operation GET THE B*TCH BACK. Right now!!!"

Then he fired another shot  posting a pic of Miss Jackson with her boyfriend Nelly and added the caption, "Nelly put this up @floydmayweather DAMN da n**ga really took your lady Champ."

So far, Mayweather hasn't responded.