A variation on the expletive bull shit. This version dabbles in a slightly more suggestive area of the animal, creating more vulgar reaction in those listening. In some, it could cause a visualization of the animal's ample anatomy creating an uneasy feeling of inadequacy, which will aid the user in his attempt to prove superior in the situation. It is a subtle twist, but a surprising and powerful one, which will ensure that the user of this word is heard. It is a statement of disbelief and/or disgust.
"See that girl over there? I just gave her yoni the old in out in out."