Mariah Carey -- No Mercy for Nick Cannon on Diss Track (TMZ TV)

Nick Cannon recently said “never say never” when it comes to getting back with Mariah Carey, but based on her new song ... he can probably go ahead and say it.

On "Infinity" ... Mariah rips Nick for not being as famous as her, not being as rich as her -- and she even dragged Fritos into this mess! Fritos.