The Brief: Stunting on means showing off.

DEEP DIVE
To stunt on or to be stuntin’ on is to put on airs or to beย fronting on. AKA Flex.
Heโs stunting on us and Iโm not even mad pic.twitter.com/FVF662L6Rr
— Best of Dolan Twins (@BestOfDolanTwns) September 1, 2018
Hard to be humble when you stunting on a jumbotron –Kanye West, “Devil in a New Dress”