rocking horse shit

== English == === Alternative forms === rocking-horse shit === Etymology === From the expression rare as rocking horse shit, with the joke being that rocking horses do not produce feces. === Pronunciation === === Noun === rocking horse shit (uncountable) (idiomatic, vulgar, slang) Something exceedingly rare or, more likely, nonexistent. Synonyms: hen's tooth, rocking horse poo; see also Thesaurus:rarity ==== Related terms ==== horseshit (nonsense) ==== See also ==== mare's nest (illusory thing) blinker fluid, muffler bearing, snark (illusory things, horseshit pretenses)