1. When you cook pasta and decide to mix lots of shit into the noodles, meat and sauce.
2. When you're on the toilet and the turds come out being very thin and numerous like noodles.
1. Guy: Poopsghetti is fucking disgusting man! Who'd ever eat that!?
2. Guy 1: I had to go number tworeally REALLY bad, but for some reason my crap ended up being really skinny
Guy 2: Oh that just means you were having Poopsghetti.