Before your comfortable passing wind in front of the person you are trying to impress, holding in all your farts means that the tiny fart molecules join together and form a fart poo. Smaller than a regular size poo, just a collection of farts forming one solid mass. Usually when the fart poo is passing through it is accompanied by a fresh batch of very loud farts which echo loudly around the toilet basin.

A person most likely to experience fart poos is the trump collector.