50 cent has a message for Floyd Mayweather….Hate Nelly! Not me! He’s the one who hooked up with two of your chicks! 50 posted a video online -- saying he heard that Floyd was talking smack about him, T.I. and Nelly. This is what 50 had to say "Woke up. I look at the computer ... the computer say 'Floyd said f**k T.I., f**k 50, f**k Nelly.'" "I'm like what he say f**k me for? Nelly f**ked your first baby mama Melissa. Then took your f**ing fiance. [You should] say f**k that n**ga!" FYI -- Nelly is currently dating Shantel Jackson ... who broke up with Floyd earlier this year.

Pictured:  Hip-hop artist 50 Cent performs during the 2014 Mets Concert Series at Citi Field on June 14, 2014 in the Queens borough of New York City. (Photo by Brad Barket/Getty Images)