kuin Esterin perseestä

kuin (“like”) Esterin (“Esther's”) perseestä (“from ass”); of uncertain origin; possibly a reference to the day traditionally named after Esther in Finland (May 16).

One urban legend has it that Esteri was the Goddess of rain in pre-Christian Finland, but that's naturally false, as the name is of Biblical origin. Another folk etymology suggests the phrase derives a brand called Esteri of water pumps used by fire brigades.

kuin Esterin perseestä (vulgar)

1. (simile) A metaphor of heavy rain or sometimes also of heavy snowfall, used like cats and dogs in English.

   Sataa kuin Esterin perseestä jo kolmatta päivää peräkkäin! ― It's pissing it down already for a third day in a row!

• kaatamalla
• kuin saavista kaataen