Deceptive Fart 

A deceptive fart would be when you are about to fart, and just before the fart leaves your asscheeks, you realize it is in fact Shit. Therefore resulting in you having to clench said bumhole and try to suck the poo up. Can result in failure, where you shit yourself, or excruciating pain.

Robert: "Man I thought I had to fart but I shit myself."
Wesley: "That's the worst deceptive fart ever!"

Deceptive Fart by 420GanjA420 April 2, 2012

fart detective 

Someone Farts and no one admits to it so they get the fart detective on the case to find out who did it.

True story, last friday I was on the bus to work and someone let rip. Damn it smelled! People started to wretch. A lilttle old lady became a fart detective and searched out the culprit who turned out to John Connor after a curry.

fart detective by AGnumbnuts November 10, 2011

Fart of deception 

This phrase describes the scenario of when you randomly smell something tasty cooking somewhere, and when you look around yourself to determine where the food is at you realise the only place for the smell to have come from was someones asshole.

Jenny and james ate curry for dinner and the next night are watching a movie.

James asks jenny if she has got the leftovers in the microwave because its smells as good as yesterday.
Jenny says no with a dirty grin and james realises he was fooled by the fart of deception.

Fart of deception by rapunzabel April 6, 2017