When it rains on Christmas Day. This occurs when the local climate/conditions are not right for snow, which of course would be a "white Christmas".
Nah mate, Down Under we never get a white Christmas because it's summer. We do get a blue Christmas sometimes when it rains, though
by Brickdictionary118 December 24, 2014

The extreme version of "Liar liar pants on fire". When someone has no credibility left because they've told so many lies. A person with ash pants has had them "on fire" so many times that their credibility has been metaphorically turned to ash, and nothing they say can be relied on.
by Brickdictionary118 October 23, 2016
