1. Pot-smokin' day, such as 4/20 (or any other day for someone with enough time on their hands).
2. Shitty pop band composed of three forty-year-olds who still wear guyliner and dye their hair and write awful emo songs about emotions they haven't felt in years. Contrary to popular opinion, Green Day was never good, and has always been a disgrace to actual punk music.
1. April 20th is the greenest day of all green days. Wanna get high?
2. You know how people sometimes say a band's shitty because they never bothered to learn more than three chords? Well, Green Day ACTUALLY didn't bother to learn more than three chords. What a lot of terrible.