Barstool Sports founder Dave Portnoy dropped $250,000 for a private meeting with Roger Goodell ... and tells TMZ Sports he plans to grill the NFL commish like a cheeseburger.
The NFL posted the auction to raise money for COVID-19 relief -- with the winner getting to watch a Monday Night Football game with Goodell in his personal "Man Cave."
Portnoy -- who made a fortune when Barstool was purchased by Penn National Gaming -- decided to drop some of his personal fortune on the opportunity for a face-to-face with Roger.
For those unaware, Portnoy has been very, VERY, critical of Goodell over the years for his handling of Deflategate, the Ray Rice situation and more.
In fact, Portnoy was handcuffed and removed from Super Bowl LIII in 2019 ... days after using bogus credentials to get into a SB media day event.
Portnoy tells TMZ Sports he doesn't know if the NFL has connected the dots and realized that he won the auction -- but says he wouldn't be surprised if they refund his winning bid and gave the prize to the next highest bidder instead.
"I could easily see them canceling this and running."
We reached out to the NFL for comment -- but so far, no word back.
But, you gotta watch the video ... Portnoy makes it clear he will have no mercy for Goodell if the commish goes through with the meeting.
Stay tuned ...