rocking-horse manure

rocking horse manure

slang Something is extremely rare or unlikely; all but, or most likely, impossible or non-existent. Typically used in the phrase "(as) rare as rocking horse manure." An honest person in politics? Yeah, that's as rare as rocking horse manure. I'm sorry to say, but the part this engine needs is rare as rocking horse manure. They haven't manufactured these in nearly 50 years!
See also: horse, manure, rocking

rocking-horse manure

something extremely rare. Australian informal
See also: manure
References in periodicals archive ?
7million worth of faith in him being able to screw the nut and realise that invitations for Scots to play in the Premiership at that stage were rarer than rocking-horse manure.
Nobody is accusing him of trying to gain an unfair advantage, or even of losing races he would have won were it not for the residue of his illicit pastime, but some are suggesting he is endangering the welfare and lives of colleagues, which makes it all the more strange that colleagues stepping forward to condemn his behaviour have been as rare as rocking-horse manure.