When it comes to rap cameos, there are few greater guest stars than Busta Rhymes. Ever since his scene-stealing verse on A Tribe Called Quest's 1992 posse cut "Scenario," Bussa Bus has famously appeared on Diddy's "Victory," DJ Khaled's "Welcome to my Hood (Remix)" and Chris Brown's "Look at Me Now."

Next, the Dungeon Dragon will appear on a remix of Kendrick Lamar's "Rigamortus" from his Section.80 LP. On September 1, Lamar let the cat out of the bag when he performed in New York and previewed Busta's verse for the sold-out crowd.

On Wednesday's (September 7) "RapFix Live," the West Coast upstart told Sway how the collaboration came to be. "He called my phone," Lamar revealed. "I never even met dude ever in life. He just called my phone one day, I'm in a studio session like, 'Yo, God, I love what you doin', son.' "

At that moment, Lamar seized the opportunity, suggesting that the Native Tongue rapper appear on a remix to his pre-existing jam. "That's a legend in my eyes, somebody I looked up to for years. All the way back from the Genesis album," Lamar said. "Yeah, I was a fan of Busta, so when I got that call ... I always had that record in mind for him to do, that's the crazy situation, 'Rigamortus.' He sent it back two days later."

Lamar hasn't yet released the song but promised that it will drop in the coming weeks. He was also very clear about one thing: "Oh, he killed me," he said of Busta's performance on the remix. "That's Busta, though."