Although usually meaning a small piece of excrement attached to the hairs of your arse, sometimes known as a Clingon, it can also mean someone who is a minor, smelly, unpleasant nuisance that is sometimes difficult to get rid of.
Tom: Hey, man, did you know that if you hold up a match by your ass and fart, it'll make a huge fireball, with green smoke!
Dick: Nah, dude. That's fartlore. Besides, only 20% of people even have methane in their farts, which is the gas that makes it possible for farts to be flammable in the first place, silly! Now go make me a sandwich.
A person who desperately defends bad people to the point of self-embarrassment. Who responds to valid criticism and evidence by farting nonsense from the mouth. The contents of the expelled wind often stink and the bar is very low. Correct emoji is 💨