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The act of rubbing a finger that has recently been in an unsavoury place(such as a sweaty bum crack/between your toes/in your belly button)accross the filtrum(under the nose)of someone, leaving them with a pooey whiff every time they breath in.
On waking John took a sniff at the world around him then realized to his horror he had been skifted whilst dozing.

Dave nearly pissed his pants with laughter as he ran his pooey digit under the nose of a friend.
by Brett July 07, 2005