I don't understand the concept of folding. It takes too much time, plus, does your bumhole really care what the TP looks like?
I just crumple it up. My hands don't get dirty because i'm coordinated.
This is weird answering the question, but I'll answer anyways... I usually take a long piece of toilet paper, then crumple it up. I use a lot if it's bad, if you know what I mean.