Killer Mike and 2 Chainz aren’t the first two MCs you’d expect to pair up, but Mike revealed that they just did “some cool stuff together” in a newly released interview with VladTV.

“A lot of people don’t know this because we weren’t doing the same type of music,” explains Killer Mike about a minute into the interview. “But as I was on my mixtape/underground ascension and he was on his mixtape ascension, we were right there together … I’m proud of him. He’s one of the dudes I really celebrate. We just did some cool stuff together too. That’s an exclusive. Only you know that. Don’t tell nobody.”

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Though the logical explanation would be some kind of musical collaboration, at this point it’s all just speculation what the “cool stuff” actually is. HipHopDX reached out to Mike and Run the Jewels’ DJ Trackstar for the specifics, but didn’t immediately hear back.

The two Georgia rap stars (Mike is from Atlanta, while 2 Chainz hails from nearby College Park) crossed paths last December, and Mike posted a seasonal greetings image of their meeting on his IG.

2 Chainz already has one collaborative album under his belt this year. His Def Jam release, Collegrove with Lil Wayne.