Devin Booker was so pissed off at a courtside heckler on Wednesday night ... he berated the dude and called him a "p***y" in the middle of a play!!!
The wild scene all went down at some point during the Suns' road game with the Timberwolves ... when Booker clearly had enough of a hearing a Minnesota fan's taunts.
The Phoenix superstar was dribbling up the court, and after the guy said something to him, Booker looked him in the eye and screamed, "Shut up, p***y!