Bore 3 Share definition Flag Butt sex. The second least desirable form of sex that can be elicited from a woman, behind only Bore 4. Dude, the second she stopped paying attention I just slipped it out and put it in Bore 3. Bore 3 by KRAKEN!! March 21, 2010 0 0 Get merch Get the Bore 3 mug. Buy Now — $32.95 See more merch