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1. A guy who, whilst being straight, enjoys a finger in his rectum during sexual relations. Also known as a Walnut Tickler

2. A person who enjoys putting his/her finger in other peoples anuses.

"You gotta try it at least once, bro.. It's the shizzle, she jams it up there and tickles your walnut"

"You're such a finger pilot, cuz Cliff."
by Dan Wilder April 29, 2008