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1) Best punk rock / pop punk band ever. Made up of 3 guys (Billie Joe, Mike and Tre) from Berkeley, California. Have released 7 albums, their newest being American Idiot. Also released two compliation albums. 2) A day where you don't do much except smoke pot.. specifically the 20th of April 4/20 or 420 is Green Day, where you smoke pot at 4:20pm on that day.
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