Underwood told The Boot
that the songwriters' idea for the hook came almost accidentally. "The guys had their guitars and they were playing something kind of bluesy, and Kara's got such a great R&B sense about her," she explained. "And I started, 'Na, na, na-ing' to whatever they were playing. And they were like, 'What if that was the hook?' I said, 'Aw, I don't know?' And before you knew it, we had 'Uh, uh, uh undo it.' I mean, who would have thought? How do you write that down on paper? It was something that it didn't take that long to write and it's so much fun to sing on stage, and people get into it. If you listen to it twice, you know all the words! We had a lot of fun with it."