What is Donkey Sanchez?
When a male (ideally) is "rooting" his beloved in the anal cavity, strikes her on the back of the cranium, in order to induce clenching of the chocolate starfish... He then completes the manouvere by wiping the anal residue on her upper lip... He then tells his mates and earns brownie points....
Oh my god, Ive just had a Donkey Sanchez