I think it might be a reference to sodomy. As in you hit or "nock" the fart in the other persons anus with your penis.
Jimmy was such a phartnocker. On one occasion he nocked a fart so hard in Suzys anus that it backfired on his shaft.
by danny March 20, 2005
by Iroically, it's Chris. August 07, 2003
buy the domain for your art blog