Rhubarb is an acronym for Really Hyped Up Beyond All Reasonable Belief. It probably originates from the etymology of fubar.

Rhubarb is a pejorative term for spin and hype, and is often applicable to media and websites.

Rhubarb can also be used as a verb, as in

"Gartner just rhubarbed Motorola's share price",

Rhubarb king nominations

Bill Gates - Anyone who can sell successive releases of software with decreasing functionality and quality stands a good chance of being rhubarb king.

Tony Blair - For those unfamiliar with British politics, Tony's New Labour cabinet has a reputation for having spin backfire. Examples of this are Consignia, Railtrack and the National Health Service waiting list statistics.