Originating from the americanism of "any idea why?" Ideay is a form of Nicaraguan slang which (in one word) refers to "what happened?" or "what is the status." Though of inquisitive nature, it is also common to find it with exclamatory use.
Similar to NMFP in usage, ie in response to an ongoing blog war about male/female relationship differences where everything is analysed to death. "Boring. IDCAYBS"