Bumb Fuck Share definition Flag ~n. Short for "bumb fuck" or "butt fuck"; typically used in conjuction with reference to a geographical location in the middle of nowhere. Dave: "Are we lost? Where are we?" Bob: "Bumb fuck Idaho." Bumb fuck Idaho, Bumb fuck Canada, Bumb fuck Egypt, Bumb fuck Yukon!...... Bumb Fuck by Iron Lung April 24, 2007 Get the Bumb Fuck mug.