This is the slightly "metal" section of this seemingly upbeat rock tune.
Be mindful of the palm mutes. Anytime you see the "P.M." markings in the tab, be sure to play solid palm mutes.
Also, you might notice that I'm doing some brief downward slides in between a few of the notes. I like how it gives a somewhat sexy feel to the transition of one note to the next. You can learn more about this downward sliding technique here if you'd like.