Josh Giddey Booed By T'Wolves Fans Amid Allegations Of Underage Relationship

Josh Giddey didn't exactly get a warm welcome at the Thunder-Timberwolves game in Minnesota on Tuesday ... 'cause fans booed the NBA guard/forward all night long amid allegations he had a relationship with an underage girl.

TMZ Sports broke the story ... police in Orange County (CA) have launched an "inquiry," with the mission of finding out what, if anything, went down between now-21 year Giddey and the teen.

Despite cops looking into things, and the NBA launching its own investigation, Giddey is still active and in OKC's starting lineup ... but the fans weren't exactly welcoming when he pulled up for their In-Season tournament game against the T'Wolves Tuesday night in the Twin City.

Several fans took videos, and you can hear the crowd voicing their disapproval of the Australian-born hooper every time he touched the ball at Target Center court.

He was also booed during player introductions.

Thunder's head coach Mark Daigneault was asked about our report during a pre-game press conference ... and refused to comment on "anything as it relates to Josh off the court."

Giddey dropped 10 points and grabbed 6 rebounds, but it wasn't enough ... the Thunder lost to the Timberwolves, 106-103.