The roof's tower of snow left behind after hastily (or perhaps lazily) clearing one's vehicle off after a snow storm. Commonly remedied by a trip down the highway.
Me: "Oh shit! Did you see that massive Revere roof rack on the way to the PotsY show last night?"

You: "Yup, I felt bad for the poor bastard behind him on 95."
by DerDoktor January 20, 2014
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