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As a verb, it is the action of farting into a bag, quickly closing it, then suddenly projecting the air into someone's face.

As a noun, it is the bag which contains said fart.
"Dude, leave me alone or I'll snarf bag you."

"I thought it was my lunch, but it turned out Bill had made it into a snarf bag."
by Anditron September 05, 2008
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