Knob Nibbler Share definition Flag A woman who loves nothing more than to orally pleasure a man. Often without exchange of money or goods. "After the 'knob nibbler' swallowed my kids, she got off the bus. I did'nt even get her name." Knob Nibbler by 04GTO February 12, 2009 0 0 Get merch Get the Knob Nibbler mug. Buy Now — $32.95 See more merch