When you think you have a nice meaty fart to let out, but the only thing that presents itself is a juicyturd bubble.
Person 1:"So Dave, let me tell ya, I felt a fart coming on the other day, and uh... Well little did I know it was a juicy 'lil turd bubble. It was horrifying"
--Person 2:"Ya I hate when then happens. Did you know that it's called sharting?"
Person 1:"Really? Well goshdarnit Dave, you do learn something new everyday, now don't 'cha?"
When you're in the process of pooping, and you happen to let a fart slide out.
A sharting spider is a particularly heinous sub-specie of the "Barking Spider" in that it's defense method is not just a warning signal and fowl smell, but also warns potential predators with a deposit of substance known by naturalists as 'beware brown'. They are particularly fond of burrowing in 'tighty whiteys'.
subject 1: (Notices subject 2's dirty underwear on the floor) "Woah! Either you never learned to wipe your ass or you were born without a sphincter!"
Subject 2: "What?....No...I'm dealing with an infestation of Sharting Spiders. That wasn't me!"
An exclamation of grave misfortune; a poopy situiation. Shartington originates from the British Isles on the hamlet of Shartington, from which the term proliferated following World War Two.
Friend 1: Oh no! I seem to have found myself in a real trickypickle of a situation!
Friend 2: Shartington!