If you think you’re too mature to spend your Wednesday evening with a band called Diarrhea Planet, you’re dead wrong. In fact, dismissing the Nashville band for its name alone is a sign of your immaturity, the musical equivalent of judging a book by its cover. The band plays infectious party rock that sounds like a cross between Van Halen and Andrew W.K., but with more energy and musicianship than either. Diarrhea Planet has four lead guitarists—yes, you read that right—and as their songs peak, all four solo at the same time. The band has played major South by Southwest showcases and basements in Columbia Heights, and no matter how small the venue, the group has an amazing knack for making its fans, new and old, go absolutely bonkers. Great poop jokes transcend age, gender, race, and nationality. So do great rock bands. Diarrhea Planet performs with Left & Right and Loud Boyz at 7:30 p.m. at the Black Cat, 1811 14th St. NW. $15. (202) 667-4490. blackcat.com.