Its kinda like a shart but in someone's face.
The spray is usually Due to the fact that you've had the shits (diarrhoea) prior to the fart.
Guy2: Yer... my bad. I was pissing like a girl out my ass earlier. Probli should of thought about the consequences beforehand ey??
2 Hours later.
Jimmy: 'My god, someone needs a fresh pair of boxers.'