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The particles of "air" that are omitted from your anal sphincter prior to emptying your bowels...NOT TO BE CONFUSED WITH A FART!
Vapours simply seep out of your bottom without pushing.
"Hey Andy have you farted?"

"Nope but I do need a s**t"

"Aha...best you go park it then...your vapours are pure eggs man"
by BFREASH February 17, 2010