Feten (fee-tin) is any foul, repulsive, sticky substance of uncertain composition (and exact origin), that finds its way onto unsuspecting people. Usually found on bar counters, public toilet seats, escalator hand rails, restaurant tables and in motel rooms.
Sam: Why's your arm sticking to everything on my desk?

Bill: My elbow picked up some feten at that last truck stop diner.

Sam: What are those dark bits in there, in-between the hair?

Bill: No idea... but if I feed them peanuts they stop moving around so much.
by Billy-Bob Savage November 1, 2010
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