1. A great punk-rock band from California which consists of Billie Joe Armstrong(Lead vocals and guitarist), Mike Dirnt(Bassist), Tre Cool(Drummer) and when they play live, Jason White(2nd guitar). Formally known as "Sweet Children", Green Day was named after a segment on Seaseme Street when one of the characters said something along the lines of "This is such a green day!" Former drummer was Al Sorbrante who quit the band after their first album 1039/Smoothed Out Slappy Hours which was released in 1991. Anyone who comes here to bash Green Day has no life and needs learn to respect all types of music.
Jen: The best Green Day album is Nimrod!
Bob: No, I think the best Green Day album is Dookie!
by Jessica March 22, 2005
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A pop-punk band that became extremely popular with the release of their third album,'Dookie', which was released in 1994 and sold over 10 million records.Green Day revived their popularity in 2004 with their critically acclaimed album,American Idiot.This album proved controversial with fans because Green day garnered many new fans that never knew who they were until this album was released.Although to this day 'Dookie' still remains the highest selling Green Day album and a favorite of most fans.
Poser: ZoMg Green Day is teh suxxors!!!!111 Tey sold out!!1No 1 new green day untilll AMerican idiot!!11

Man with a brain: No they didn't.They just became popular agian like they were in the 90's.And American Idiot is not even their best-selling album.
by Jonmad August 28, 2006
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A band is not punk,used to sound punk, but now are mainstream/alternative rock, others might include A.F.I. and Blink 182
Green day could care less about what music they play so long as they make a lot of money
by Drakethacrusty March 27, 2009
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A day spend entirly being high or just smoking weed/marujuana. Also a mainstream punk band.BEST BAND IN THE WORLD!!Green day rock! They changed their name to green day from sweet children when they themselves had a green day. They now say they have quit taking drugs but they openly admit that sometimes you might find them blazing(smoking pot
Guitar/Vocals-Billie joe armstrong,34
Bass/Vocals-Mike Dirnt,34
Drums/Vocals-Tre cool(Frank Edwin Wright III),33
Additonal Guitarist/Vocals-Jason White,32
The number 1 band in the world???....???...Green Day!!!!!
by guitarhead September 3, 2006
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A Punk Rock/Pop band from Oakland, California. Started out in 1986 as sweet children and later changed their names into green day. Started releasing music as independant artists and in 1993 signed to a major label to release their hit classic, Dookie, which would go on to sell 15million copies worldwide. After their 1995 album Insomniac, the band would expirment with other genres such as hardcore punk, ballads and folk punk (as seen in Nimrod and Warning). The band's latest album, American Idiot, shows them experimenting with rock operas and more politically driven lyrics, as well as a less distortant, cleaner sound. Their new, political, left wing image caused many older GD fans to critisize them as "sell - outs" when they had been on a major label for over ten years. Sadly, most of their new fans only know them from American Idiot and never heard the old green day, who sounded more like a mixture of the Sex Pistols and The Ramones.
Haven't you ever heard wake me up when september ends? It's fucking great!

Haven't you ever heard Brain Stew, poser Green Day fan?
by BrandonRamone April 24, 2008
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1. A band which kicks major ass.
2. Saint Patrick's Day
3. A good day to smoke up.
1. Green Day is off the heezy.
2. Tomorrow is Green Day!
3. I'm bored, I think it's time for a Green Day.
by Chris Johnson January 9, 2004
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1. a day wasted smoking pot. john kiffeysomething, the old drummer from the band green day came up with it and also wrote a song about it. comes from sesame street. the guys were fucked up, eating cereal and watching sesame street, big bird said green day, they thought it was funny.
2. a song by al sobrante (aka john kiffeysomething) appears on 1039/smoothed out slappy hours.
3. a band
dude, every day this week was a green day. thats like 20 days man!
"Pictures sounds
Of moving insects so surreal"
i saw green day play yesterday.
by catherine March 5, 2005
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