kuin Esterin perseestä

Etymology
; of uncertain origin. 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.

One possible source of the saying is the Esteri-branded water pumps used by fire brigades.

Phrase

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

Synonyms

 * kaatamalla
 * kuin saavista kaataen