A decent band that earned the nick-name 'sell-outs' because their latest album, American Idiot, was popular.
Bruce: Gawd, Green Day is just a sell-out band. They aren't as good as they used to be.

Wayne: Why, because their album did well, and they gained a bunch of new fans?

Bruce: Well, the fans are a bunch of tweens that never listened to their old albums.

Wayne: Wow. I didn't know you had to like EVERY album and EVERY song they made in the past to be a fan of their current work. Dipshit.
by LadyHailey August 27, 2008
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Not to be confused with the American punk rock band formed in 1987, Green Day is the slang term used for that final stage in a head cold or sinus infection during which copious amounts of green mucous and nasty phlegm and discharge come pouring from your nasal passages, throat and lungs. Green Day's arrival is generally a sign that better days are ahead and the wretched demon virus is nearing the end of its course.
Constance was stricken with a wicked virus and her sinus was clogged for over a week. She was excited and welcomed the arrival of Green Day and she started to get some relief although it was quite phlegmy for a while.
by Eaton Holgoode February 23, 2014
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An American rock band formed in 1987. The band consists of Billie Joe Armstrong (vocals and guitar), Mike Dirnt (Backup vocals and bass guitar) and Tre Cool (drums).
After releasing the album "American Idiot", they gained a great deal of popularity. The album deals with the George Bush era and the Iraq war, as well as being a teenager in disadvantaged areas of America and thus being without prospects for the future.
Their latest album, "21st Century Breakdown", deals with the economic crisis, war and religious fanaticism amongst other themes. Although musically their latest album is not considered to be as strong as "American Idiot", it's lyrics are very advanced.

Green Day are different to many other modern bands in that they sing and play music about the objective world, about relevant issues which affect a lot of people.
Green Day are a breath of fresh air in the current musical world.
by ShineOnYouCrazyDiamond August 9, 2009
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A once kick ass punk band
They started out as "Sweet Children" Playing an infamous punk club called gillmans street
later touring the u.s. and making two albums before releasing a punk masterpiece: Dookie
This did attract a lot of younger people and the people of gillmans street labeled them sell outs

In response Green day released Insomniac

A bit like dookie except a bit harder and faster

Then after that i call the downfall
They released Nim rod: A weird experimentation of Green day's sound then they released Warning
A bit more "poppy"

Then they released the all terrible: American idiot which they are now known for
If you really apreciate green day

you would of liked their first four albums
1. 39/smooth

2. 1,039/smoothed out slappy hours (combination of first album and EP's
3. Dookie
4. Insomniac
Girl: ZOMG BILLIE JOE IS SOOOOOOOO HAWT!
Me: You have failed to recognize the true talent of green day
by The open minded metal listener December 19, 2010
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(n) 1. a band that used to be good but was taken over by middle schoolers, 9th grade girls, and fake-ass emo chicks.
2. a day where you smoke weed and drink booze; also called 420
1. Green Day is an example of, well, a Green Day band.
2. Stoner: Wow, look at me, I smoke weed, I'm cool, it's a green day.

Some dude: You mean, like the band.

Stoner: Uh, no...wait, what?

Some dude: Didn't you just mention the band Green Day?

Stoner: Oh, you mean the "I walk this empty street on the boulevard of cocks" guys.

Some dude: Yeah

Stoner: oh

(Stoner pulls out shotgun for no apparent reason and blows dude away, because thats always what happens at the end of these gay dialogue thingys)
by Dude Man guy April 21, 2005
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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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