The song Flex by JAY1 is about his confidence and ability to stand out from others in a social setting. He boasts that nobody can flex like him and that he always looks stylish and cool. Despite the heat in the room, he maintains his "drip on freeze" and draws attention from everyone in the room. JAY1 also mentions smoking marijuana with his crew, but denies a girl's request for a photo. Overall, the song is about JAY1's confidence and unique style, making him the center of attention wherever he goes.