IKNOWDATBITCH Share definition Flag The odd occurrence in pornography where you know one of the female leads. Common since there is so much amateur on the net now. Brad's fap was ruined by a classic case of IKNOWDATBITCH. IKNOWDATBITCH by Herr Eliot March 8, 2008 0 0 Get merch Get the IKNOWDATBITCH mug. Buy Now — $32.95 See more merch