The moment when you think you smell a fart, but nobody actually farted.
Your standing with a buddy and suddenly smell what you think is a fart so you say "Hey man, something smells like shit. Did you just blow ass?" And he says "Na man, you must be having a Craptical Illusion!"
A Latinised-sounding high-brow word for a dumb-arsed dumb-bunny, usually being one with incipient learning difficulties, who thus is going to spend half his life in a mental funk because he can do nothing right and the other half tormented by the question of why he can do nothing right, and so, in the evolutionary stakes, is in fact a born loser.
I suppose that in describing your behaviour you’d have to be called a cretinous-cretinalias, if only because you look so confoundedly like a classic one.