A coup de grace where one drags their finger through their ass and wipes it under a rivals nose. Though, not used very often after adolescence, a dookie finger carries more weight than a slap in the face with a white glove.
Jacob wanted to give her a dirty sanchez before she dumped him but she wouldn't let him tap that ass, so he had to settle for a dookie finger.
by keifermail August 14, 2009