What's the name of this song from Grey's Anatomy?

I didn't really catch the words clearly but I know the scenario, The interns were racing for some kind of prize,then when they finished the race I remember Izzie being there and the Chief,they started asking them questions about a diagnosis i think,Lexie won,but as they were running in the hallway i think the lyrics were kinda like -,,Poleka,poleka,ooh,anjoleka,joleka"-th… song was singed by a girl and in the middle of the song there was a rap,it had a really nice cool hip-hop beat too, PLEASE ANSWER IF U KNOW WHATS THE NAME OF THE SONG!!