Assknifed Share definition Flag Where you wipeout and your board flies up vertically and hits you in the ball sack or up the crack of your ass. Dude, I just got pwnt when I accidentally assknifed! Assknifed by Psychopathic J January 5, 2008 0 0 Get merch Get the Assknifed mug. Buy Now — $32.95 See more merch