Rap mogul Irv Gotti is a hardcore New York Knicks fan -- and he didn't hold back when we asked how he felt about the Knicks striking out in free agency ...
"Man, F*ck Dolan!"
Yeah, he ain't happy.
Gotti -- along with a bunch of other Knicks fans -- are furious with owner James Dolan for not signing any of the marquee free agents up for grabs over the past few days.
He's especially upset about Kevin Durant -- who not only didn't sign with the Knicks, but inked a deal just down the way with the Brooklyn Nets.
Ditto for Kyrie Irving and DeAndre Jordan.
"Yay for the Nets," Gotti told TMZ Sports sarcastically the other day ... "I feel like Stephen A. Smith. I'm disgusted."
Dolan has been having a rough 2019 -- back in March, he took a lot of heat after he was caught on video ejecting a Knicks fan from Madison Square Garden after the fan heckled Dolan to sell the team.
The Knicks took R.J. Barrett in the 1st round of the NBA Draft -- and a lot of people are hopeful he can turn the franchise around ... but Gotti doesn't seem convinced yet.