Butters did fill out his training log; he was always good about both training and homework, to help avoid being grounded, which meant that he got a Twinkie and he decided it would make an excellent snack before shootin' up some zombies.

"Hey, there, Mr. Twinkie, what'd'ya know? Are ya gonna get eaten? Yes, I do think so!"

This act of unwrapping the Twinkie for consumption before limbering up required a song, apparently.