My mother has weird dreams

Last week my mother was telling me about a weird dream she had.

She dreamed there was a tornado approaching her house, and it passed through a cow farm first. Its trip through the pasture caused it to pick up all the cow poop.
So there it was, heading for her house, with a plethora of bovine poop swirling around and around.
What did she call this?

A "Turd-nado", of course.
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