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1.
(n.) A situation where an idea or thing has very little probability of existing or continuing to exist. In the same vein as "a snowball's chance in Hell," except less dependent on Christian ideologies.

Based on the idea that a mass of flatus has very little chance of being smelt if it is whisked away by the high-velocity air currents native to the windtunnels used in aeronautics testing.
Your new newsblog doesn't have a fart's chance in a windtunnel unless you plagiarize the shit out of other more prominent newsblogs.
by jableshables August 19, 2010