Flasterbate Share definition Flag Accidently or purposefully flatulating while masterbating. Defined at Neven's Pond, Keith County, NE. Keenan: Man I farted while beating it. Phil: Dude, don't flasterbate in the lodge. Flasterbate by D.J. French Toast August 25, 2008 0 0 Get merch Get the Flasterbate mug. Buy Now — $32.95 See more merch