The phenomenon of having large amounts of methane build up, usually after a big night of drinking “Tooheys New” (an Aussy beer) causing one to repeatedly let out sizable farts, usually of an excessively pungent nature. One should be careful not to “follow through” the fart and begin “Sharting like a trooper”
When somone is farting very often. It is derrived from the fact that the smell must have become overpowering after being stuck in a city for ten years.
Father's triple portion of baked beanswashed down with half a crate of Mexican beer resulted in a terrific 'trumpet involuntary', and Mother complained that he was farting like the Barber's Cat.