In a three-some (two men, one woman), when each of the males performs anal sex with each other after recently excreting. Then taking a fork and scraping off any "poo" residue from their penis' and then both ejaculating onto the fork. Finally, taking the fork and inserting the fork into the woman's vagina then hand feeding her the substance(s).
Me and Mark gave Janine a German Thrust Fork!
by vulgardisplayofmurder June 10, 2009