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Green Day is the name of the now band formerly known as Sweet Children, from Rodeo Cali. The members were potheads as teenagers and were watching Sesame Street once, and they said 'green day' at some point on it and they thought it was funny. So, it became slang for day spent smoking marijuana. John Kiftmeyer (aka Al Sobronte, former drummer of Green Day) had a jacket made that had 'green day' written on the back, and eventually they decided to make it their band name. They also have a song called 'Green Day' that is pretty much about the same thing. Also, the best band in the world, btw.
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