When someone shoves one of their fingers up their arsehole
, then pulls it out to see if shit
gets on their finger or not in order to decide something one way or another. A game of chance, of sorts, like flipping a quarter to decide or determine something. If shit gets on your finger the answer is "No", but if you pull it out clean the answer is "Yes".
Well, I don't know if I should go to the show tonight or not. I guess I'll have to decide using the Fecal Finger of Fate.