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The act of deficating on an automobile windshield. It can be used in place of or conjunction with the built-in heater to help remove frost or ice. A variation of the Cleveland Steamer or Boston Pancake.
"Dude, I can't see, there's too much ice on the windshield"

"No problem I'll use the Detroit Defroster to 'clear' that right up"
by phishQuotes August 31, 2013