Toilet paper which is just one sheet thick. This toilet paper is discounted and should be used at your own risk. Your fingers will frequently go through the toilet paper creating a mess that would not occur if you were not so stingy as to buy one ply in the first place.
Guy 1: Fuck, u smell like shit. What happened to you?
Guy 2: I'm low on money this week, i've been using one ply.