Upside Down Boner Share definition Flag When an erection is restricted from achieving the 45 degree upright angle and points south instead. some bitch at da club wuz backin up on my shit and my belt gave me an upside down boner. Upside Down Boner by DFA, bitches October 8, 2011 0 0 Get merch Get the Upside Down Boner mug. Buy Now — $32.95 See more merch