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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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A day when one who personally does not have any marijuana of there own, still manages to get high all day, via friends, or just being in the right places at the right times.
"I was out of weed, but thanks to the generosity of my friends, I had a green day."
by Hondro March 03, 2004
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32
really good band. have been good since they started, which means that american idiot is not their first album. i do not care that people like their music now, but it would be nice if they would appreciate that they had loads of albums BEFORE american idiot which were equally as good. there is more to this band than 'hot' billie joe armstrong, which means all you idiots who think you are his secret wife or something should just shoosh. and american idiot and boulevard of broken dreams are NOT their only songs (horror of all horrors).
*silly girly girl* - omg! green day are just sooo amazing! i love american idiot! it's like, so totally the best song EVER! don't wana be an american idiot!
by jk March 19, 2005
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Green Day, A band that teens are going wild over, who probably don't know that they even had any other albums besides American Idiot and 21st Century Breakdown. A true Green Day fan would know about: Insomniac, Dookie, Nimrod, Kerplunk, Working Class Hero, and Warning. Now all you hear is girls screaming on about "OMG Billie Joe is so cute have you heard there new song 21 Guns OMG OMG!! There first album American Idiot was sooooo good OMG!!"
Girl 1: OMG have you heard of that new pop band Green Day!!??
Me: New? they've been around for almost 20 years!!
Girl 1: nuh uh!
Girl 2: yah they have
Me: thanks you must be a true fan
Girl 2: yah...my favorite album is Nimrod
Girl 1: Nimrod?? Whats a Nimrod??
Me: one of their albums
Girl 1: wait...

Girl 2: yah...
Girl 1: so your saying they have more than two albums...
Me: NO FRICKIN DUH!!!!
Girl 1: well i like their new stuff
Me: there new stuff is okay but it got to pop-ish
Girl 1: i thought they were always pop-ish
Girl 2: nooooo they used to be Punk
Me: COMPLETE PUNK

Girl 1: whatever
Me: non-believer of The Green Day
Girl 1: what
Me: nothing...you didn't hear anything
by XxLuvDentzxX December 04, 2010
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This is a band you used to listen to and kids would make fun of you. You would then work hard on your music, get more involved and the punk rock scene would advance and grow.

And now you make fun of kids with Simple Plan shirts.
5 years ago: "Hey, look at the kid with the Green Day Shirt"

Now: "Hey, look at the kid with the Simple Plan shirt"
by Revolver September 14, 2004
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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 21, 2005
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