First off, it seems impossible to write about the band Diarrhea Planet without commenting on its name. These rockers from Nashville must’ve wanted people to say, “Ewwww,” when they decided to give themselves such a disgusting moniker. The music itself, however, isn’t as subversive as the name suggests. This is basically full-on hard rock music with no less than four guitarists going at it simultaneously. Maybe the “diarrhea” in the name alludes to the outpouring of riffs and solos. In any case, the group barely let up for a minute during its set on Saturday, Nov. 16, at the Beat Kitchen. And the fans, who had crowded into the small club, responded with nearly nonstop moshing.