[A photo of sour milk (removed by blog master Sudo Nimm in kind consideration of the lactose intolerant among you).]
I know you've been racking your brain on this one, so I can't allow you another sleepless night as I've had. This is the real reason we get writer's block.
Something literally stands between the bridge of two synapses in the brain, blocking the flow of electrical impulses. That something in this case is a relatively obscure process in search of a name.
Without further ado, may I present bonnyclabber: milk that is curdled by natural souring.
You've gotta love the Irish.