F'n B's in the A Share definition Flag General party term. Stands for Fucking Bitches in the Ass. All I wanna do is F some B's in the A. OR What are you doing tonight? F'n B's in the A F'n B's in the A by Korinda & Ashley November 10, 2008 0 0 Get merch Get the F'n B's in the A mug. Buy Now — $32.95 See more merch