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.
(adj.)
pre-joint: as one is doing the preparations or actions of rolling a joint, they encounter a diminutive amount marijuana residue on their fingers.
post-joint: after one, or a group has successfully smoked and passed around a joint, they may realize their fingers have a sticky marijuana residue, that may even have a slightly odorous resonating smell.
"I'll massage your face but I've got to warn you, I've got doobiefingers right now."
"No, I can't do that right now, I have doobiefingers."
"And then I tried to wipe my hands #doobiefingers'"
"Man, I can't eventype anymore because of these doobiefingers."