Migos Labelmate Metro Marrs Busted for Making It Rain at HS Graduation

Rap phenom Metro Marrs drew a loud ovation after making it rain at his high school graduation ... but the stunt ended up getting him detained by cops.

So, here's the deal ... Marrs graduated from Langston Hughes High in nearby Atlanta and when he crossed the stage Friday, he decided to go out with a bang. You can see from the video he took wads of cash out from his pants and made it rain ... to the delight of his fellow grads.

The crowd went absolutely nuts ... and grads were more than happy to raise their arms and catch all the green. But, school officials were not happy campers. You can see several of them get up off their seats to corral the 18-year-old rapper who just recently signed with Quality Control ... the label home to Migos, Lil Yachty and City Girls.

Marrs, though, had a can't-stop-won't-stop attitude ... 'cause he kept going into his waistband for more dough. All-in-all ... he threw around $10k in cash to his cap-and-gown colleagues.

Cops stepped in to escort him out of the ceremony ... and we're told he was detained for inciting a riot and disorderly conduct and then ticketed for the offense.  If you ask us, it's ridiculous -- inciting a riot because the grads grabbed some dough?  Really outrageous.