Shareef O’Neal Crazy Dunk Sesh ... w/ Migos' Quavo

Here's Shareef O'Neal busting out some insane alley-oop dunks ... courtesy of rap superstar Quavo.

The Migos member lobbed up a pair of dimes for Reef before a pickup game on Friday -- and the 17-year-old threw it down hard both times, including a pretty sick reverse jam.

Quavo ain't half bad either -- in fact, the dude was a star athlete back in Georgia and balled out as the QB on his high school football team.

As for Reef, he's already committed to U of Arizona.

Sucks for ASU.

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