hippo fart Share definition Flag A very large smelly fart, the kind of which you would expect from a two-ton mammal, but actually coming from a human. Hey dude, don't be cutting those hippo farts around me. You belong in a zoo. hippo fart by LaughingAloud November 3, 2005 0 0 Get merch Get the hippo fart mug. Buy Now โ $32.95 See more merch