Mobbed By Fans After Hitting Insane Game-Winner

The NBA season is over, but Trae Young is still doing ridiculous things on the hardwood ... here's the Hawks superstar hitting a game-winner in a pro-am match Monday that sent the arena into an absolute frenzy!!

The game -- part of Skinz League action in Oklahoma City -- was wild ... Trae was getting buckets, hitting 3-pointers from near the half-court logo and blowing by defenders with ease.

Highlight videos show the 22-year-old just went off ... yet, somehow, the dude's team found itself down 90-88 -- and facing some big-time smack talk.

But, in video Young posted late Monday night, you can see he let the chatter fuel him ... eventually hitting a dagger over the trash-talker with no time…