Something that is stupid and unexpected.
Pronounced "BUH-NEE!" in the style of the character from Nightmare Before Christmas who excitedly proclaimed BUH-NEE! upon seeing the easter Bunny.
There is no proper sentence structure for this word. It is a statement unto itself. Example: You see someone/thing stupid and you can't believe what you're seeing. You point at the person/event and proclaim "BUH-NEE!"