Cow pissing on a flat rock
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!"
"Yep, it's getting set to rain like a cow pissing on a flat rock!"
raining like a double-cunted cow pissing on a flat rock
An archaic "hick" term for heavy rain or snow fall.
"Sheeeeeet! It sure is cumin' down out there! Raining like a double-cunted cow pissing on a flat rock!"