That's as good a guess as you'll probably get.

My shot will be in the opposite direction, and will probably circle the globe and hit tsuwm in the butt...

I propose it is a typo. The word should be "musculation". Although this is not a common term, it refers to body-building activity, muscle development and so forth. Apparently the word is spelled exactly that way in French, at least, and probably was borrowed from it. Given the context, it makes some kind of sense, perhaps more than as an invented word as written. What do you think, tsuwm? :0)