"What's Poppin" by Jack Harlow is a party anthem that celebrates the glamorous life of luxury associated with the rich lifestyle of modern time. The song is about having fun, living it up, and expressing the joys of wealth. It talks about going out to the club, getting a new car, and spending the holiday locked in with friends. The lyrics also touch on having self-confidence and unapologetically "flexing on" others. The chorus reinforces the sentiment that this is an upbeat song about living itup and being above others with its playful lyrics and catchy beat.