Some quick background on McClung ... the Tennessee native has been an acrobatic dunker since high school and played two seasons at Georgetown, where he averaged 14.7 points and 2.2 assists per game. He also spent one year at Texas Tech.

Despite McClung's athleticism and scoring capability, the point guard went undrafted in the 2021 NBA Draft ... but spent time with the Lakers and Bulls G-League affiliates. He also had a short stint with the Warriors.

The Sixers recently signed Mac to a 2-way contract with their affiliate, the Delaware Blue Coats ... meaning he can play up to 50 games before deciding if they keep him full-time.

Now you can see why McClung wasn't necessarily a familiar face amongst the NBA crowd until he won the dunk contest in Salt Lake City last weekend, reviving a competition that has been pretty boring over the past few years.

Mac's cousin, hip hop artist, Riff Raff -- who has been promoting McClung for nearly 6 years -- tells us he's happy MM's finally "getting the notoriety that he deserves" ... and then he proceeded to call out the Lakers and Warriors in the process.

"He's been on the Warriors, they fumbled. He's been on the Lakers with some of his favorite players and he's playing with them and they fumbled that and now he's over there in Philly," Riff Raff said.

"He's the new Ivory Iverson!!!!'

Riff Raff continued ... "Any NBA team owner would be foolish to not wanna fill the stands and get hat hype around their team. To me, and to anybody who actually watches him play, he's a starter."

But, Jody Highroller wants you to have one thing straight ... there's more to McClung than dunking, calling the 6'2" baller an "actual hooper" who's more than just an explosive/athletic player.

But, don't get it twisted ... Riff Raff believes McClung will take over the dunk contest for many years to come, forcing NBA superstars to participate.