The Brief: Stunting on means showing off.

Bluesquiggle
DEEP DIVE

To stunt on or to be stuntin’ on is to put on airs or to beΒ fronting on. AKA Flex.

https://twitter.com/BestOfDolanTwns/status/1035742501754351616

Hard to be humble when you stunting on a jumbotron –Kanye West, “Devil in a New Dress”