pour down like a cow pissing on a flat rock

== English == === Etymology === Compare piss down, piss it down, and French pleuvoir comme vache qui pisse (“rain like a pissing cow”). === Adverb === like a cow pissing on a flat rock (not comparable) (US, of rain or other liquid falling, vulgar) Heavily; copiously (and often loudly). For more quotations using this term, see Citations:like a cow pissing on a flat rock. ==== Translations ==== === See also === like a cow on a flat rock === References === 2005, Jonathon Green, Cassell's Dictionary of Slang, Sterling Publishing Company, Inc. (→ISBN), page 1170, entry rain like a cow pissing on a flat rock