What Does That Mean?

I'm looking over some code that I wrote just prior to going on vacation, and have been forced to say to myself "What does that mean?" I have variables that I'm not sure make sense in context, and I'm not quite sure exactly what they represent despite the fact that I added comments after their declaration. Even after I go over more of the code further down, I'm not quite sure it's right, even though it seems to be working. Never before have I been baffled by my own code so soon after writing it. This process generally takes several months to occur, not two weeks. I guess I was already on vacation before I even left.