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A particularly hard rain storm. In other words, it's coming down so hard, it's as if a cow is pissing on a flat rock.
"Wow, look at them clouds rolling in."
"Yep, it's getting set to rain like a cow pissing on a flat rock!"
by HAL 9000 February 26, 2008

Words related to Cow pissing on a flat rock

cloudburst coming down hard drencher. pouring down rain cats and dogs