Cobra Knob Share definition Flag Someone with a bent knob, dick or willy. a cobra knob is very horrible to have put up your minge Guy: Check out my sweet dickGirl: URGH what a cobra knob get it away from me! Cobra Knob by Astortheviking February 7, 2010 0 0 Get merch Get the Cobra Knob mug. Buy Now — $32.95 See more merch