Kunal Nayyar and Mayim Bialik may play a science geek and a nerd on the comedy show The Big Bang Theory, but they can be cutting-edge savage if they need to. For evidence, look no further than their epic rap battle on Drop the Mic.

Forgetting their meek, awkward characters on the show, the stars did some brutal mutual roasting. Nayyar, who plays Rajesh Koothrappali on the show, started the rap battle: “It’s my pal Mayim, isn’t that awesome? She’s a former child star who never quite blossomed.”

Bialik’s response? “I’m here to win this, so I hope that you hear me. You’re a tiny star, I’m the big bang theory!”

The winner of the battle was determined by who got the loudest cheers from the audience, but honestly, we think they both won.