Bwerp Share definition Flag Slapping your balls against your ass in a rhythmic motion creating a slapping sound . Also known as Testicle twerking. Bill came out of the shower and started to bwerp, much to Shannon's amusment Bwerp by LoxlyVonbeardmire May 12, 2018 0 0 Get merch Get the Bwerp mug. Buy Now — $32.95 See more merch