Top definition
a setting on most cars and vehicles which removes frogs from the windshield
the window is all froggy better turn on the defrog
by Matt Huff November 11, 2009
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2
to defrost or defog ones windows for visibility purposes
Garrett ran into a car parked on the side of the road because he did not wait for his windows to defrog.

I spent an hour sitting in my icy car while my windshield was defrogging.
by Mr. Pudo April 04, 2011
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