Former Bad Boy rapper Mase is coming out publicly, to explain exactly how he claims - Sean "Diddy" Combs robbed him.

According to Mase, Diddy tricked him into signing over the rights to all his music, for just $20,000. And now Diddy is refusing to sell them back - even for $2 million.

Mase was triggered on Sunday after Diddy made a "pro-Black" speech at the Grammys, where Diddy blasted "other ethnicities" for "taking advantage" of Black artists.

But according to Mase, Diddy did exactly that to him, and called it "Black Excellence."

He wrote:

@diddy I heard your #Grammy speech about how u are now for the artist and about how the artist must take back control. So I will be the first to take that initiative. Also, before we ask of other ethnicities to do us right we should do us as black people better. Especially the creators.

And more:

Your past business practices knowingly has continued purposely starved your artist and been extremely unfair to the very same artist that helped u obtain that Icon Award on the iconic Badboy label. For example, u still got my publishing from 24 years ago in which u gave me $20k. Which makes me never want to work w/ u as any artist wouldn’t after u know someone is robbing you & tarnishing your name when u don’t want to comply w/ his horrendous business model. 

Mase had more to say:

To add insult, u keep screaming black excellence and love but I know love isn’t free. So I offered u 2m in cash just a few days ago to sell me back my publishing(as his biggest artist alive) that always show u respect for u giving me an opportunity at 19 yrs old. Your response was if I can match what the EUROPEAN GUY OFFER him that would be the only way I can get it back. Or else I can wait until I’m 50 years old and it will revert back to me from when I was 19 years old.