He was part of the rap group Public Enemy, which is how he got famous. Chuck D was Flav’s counterpart in the group and did the rapping, while Flav was the hype man in the background repeating whatever Chuck said while wearing a clock, with his signature phrase of yeahhhh boiiiiii.
Then then parlayed that fame into and old reality show called Flavor of Love, and was most recently in the news for getting beaten up at a Vegas casino.