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Noun. The juice that forms around the choda of a male (or perineum of the female), between the genitals and anus.

A mixture of sweat plus ass, dick/ball or vag juice.
"Man, I worked up a gigantic amount of McFetty after my long shift in the kitchen."

"I was going down on this chick I picked up at the club and all I could taste was pure McFetty."

"I pissed off the waiter, so we're probably going to get some McFetty on our pizza."
by Johnny Darko May 03, 2008