8:04 AM PT -- McGregor has now deleted his reply ... only minutes after he sent the tweet.
7:46 AM PT -- Conor has now responded to Dana White and Nate Diaz ... posting a short video from their fight, showing McGregor landing a left hook on Nate's chin, momentarily dropping him to the Octagon canvas.
Conor wrote ... "Bounce them titties for the dollar"
Nate Diaz isn't shooting down a third fight with Conor McGregor, nor exactly is it a lock ... the UFC superstar says "The Notorious" needs to rack up a few Ws and show he isn't soft before they step in the Octagon again.
"Conor’s gonna have to get him some wins and prove he’s not so fragile first .." the UFC superstar from Stockton tweeted.
Nate's reacting to a recent TMZ Sports interview with Dana White... where the UFC president was asked if the curtain had closed on a trilogy fight between two of the biggest UFC stars who have ever lived.
We asked the question after Diaz recently told us he had one fight left on his UFC deal ... and he intended to fight Dustin Poirier and then lay down his gloves and retire.
So, third fight? Here's Dana.
"We're still working on [the Diaz-Poirier] fight. That fight's not done yet. I wouldn't count out a Conor-Nate 3," White told Babcock on the "TMZ Sports" TV show (airs weekdays on FS1).
The UFC prez added ... "Listen, I'd be shocked if that fight didn't happen again."
Of course, the guys previously fought twice -- two of the top-selling fights in UFC history -- each winning one. Diaz submitted McGregor in March 2016. Then, the Irish superstar beat the Stockton superstar by majority decision when they rematched in August 2016.