Bob tried to make a joke, but it didn't turn out as good as he hoped. Maybe he shoehorned a reference in too awkwardly (shoe goes on, shoe goes off), or he has bad comedic... timing, or he just wasn't able to tell what was supposed to be a snappy joke in a snappy manner, so the wording he used ends up taking up way too much space for something that really wasn't worthwhile to anyone who was reading it in the first place. Or maybe he relied on a Stock Shtick that everyone's heard a million times.
For those who are not drummers, the "ba-dum-tssshhh" you think of when someone says rimshot is not a rimshot. A real rimshot is when you hit the edge of the drum and the head at the same time. The "ba-dum-tssshhh" is called a "sting".
You can also get a rimshot on demand here.