Ninja and Pirate

So if he burps, does that count as a fart or a burp? Like if he has a mouth down where his butt is and he farts, but it comes out his face butt’s mouth, does it count as a burp or is it still a fart? What makes a burp a burp and not a fart? These are the deep philosophical questions you are challenged with when you read Ninja and Pirate.