A band formed in the late 1980s by lead singer/guitarist Billie Joe Armstrong, bassist Mike Dirnt, and drummer John Kiffmeyer. After their first album, Kiffmeyer left, and drummer Tre Cool joined, cementing the lineup.

The band first became famouse in the early-mid 90s due to their independant albums 39/Smooth and Kerplunk. The success was improved upon with 1994's Dookie and 1995's Insomniac. Subsequent albums Nimrod and Warning were less successful, though they yielded popular songs such as Good Riddance (Time of Your Life) and Minority

Though their popularity began to sag, the band came back with the multiplatinum 2004 'Punk Rock Opera' American Idiot, which detailed the story of the Jesus of Suburbia, St. Jimmy, and Whatsername as they navigate the waters of Bush-Era America. The album was both critically and commercially successful, and spawned a profitable world tour.

The band's next release came in 2009, 21st Century Breakdown. Similar to American Idiot in concept, the album varied in style and was praised for its diversity. Like the previous album, it's a 'Punk Rock Opera', following two 20somethings, Christian and Gloria.

Music Elitists that don't actually know what they're talking about like to use Green Day as an example of a band that is a sellout because they signed to a major label. Obviously someone doesn't remember The Clash in 1977.
Guy 1: Hey man, I got Green Day tickets, want to come?
Guy 2: Screw that man, Green Day sucks, they're not punk.
Guy 1: Elaborate.
Guy 2: Well man, y'know, girls think Billie Joe is cute, and like, they sold out, and...and they did an acoustic song and they just suck.
Guy 1: You're an idiot. Hey dude, Green Day tickets, up for it?
Guy 3: Hell yeah!
by A Guy Who Knows Things May 18, 2009
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A day spent smoking marijuana.
Saturday was a green day.
by Anonymous September 18, 2003
A sort-of punk rock band that was good but not extremely popular until recently, when thousands of teenyboppers found out about them on TRL, believing their newest and worst CD to date to be "teh bset". Now every fourteen year old in the country rants about how great Boulevard of Broken Dreams is and are known to exclaim things such as "OMG BILLY JOE IS HAWT!!!1" and "DONT WANNA BE AN AMERICAN IDIOT!!12". Their new CD is mediocre at best, so please listen to their other albums instead.
The typical Green Day "fan" has never heard of Nimrod or Kerplunk, but totally eats up the new pop-punk garbage.
by Chernorizets Hrabr March 16, 2005
1. A day which is mainly spent smoking the drug marijuana, in an effort to end boredom. May have originated in California in the mid-80's.

2. A popular punk rock band with members from Rodeo and Willits, California.
1. I had a green day yesterday.

2. Mike Dirnt and Tre Cool are also members of Green Day.
by Crispy September 01, 2004
Quality band which poeple tend to see as sell outs because of their last album American idiot. For me they will always be remembered for Insmoniac and dookie two of the best punkish albums I have in my collection. Unfortunatly their main following now consists of teeny boppers who only discovered Green day existed when Boulevard of broken dreams came out and wouldn't know "At the library" from "Westbound sign" Still i suppose they had to find someone to fantasise over after Busted split up. DAMN YOU CHARLIE!!
girl 1: "wow have you heard that new band Green day?"
girl 2: "Yeah, billie joe is gorgeous"
me: "For gods sake! they have been around for 15 odd years!"
girl 3: "really? wow do you reckon Nirvana will ever get back together? that would be qualtiy"
me: *sound of me crying on the floor in utter despair*
by Guvnor P June 27, 2005
1) A day to smoke weed.

2) Popular American pop-punk band with such classics as Good Riddance (Time of Your Life), Basket Case and Longview. Sometimes said to be inspiration for various later pop-punk bands.
1) It was a green day.
2) I am going to the Green Day concert next week.
by jazzpup February 04, 2005
1) An awesome rock band lead by singer Billie Joe Armstrong that has many hits like When I Come Around, Welcome to Paradise, Basket Case, She, Brain Stew, Time Of Your Life, Warning, Minority, and Don't Wanna Fall In Love
2) A day when you just sit around and do nothing but smoke weed
1) Man, right now I'm listening to a Green Day CD and the songs are awesome!
2) That stoner's has 1 too many green days. He's trippin, man!
by 000 March 22, 2004
1) A most wonderful band in the opinion of many. They actually came from humble-to-hectic roots in California- all children of deadbeat parents, but all musically talented. Their usual music is literally exactly what an unhappy, confused, and possibly disgruntled teen goes through; subject matter ranges from sitting around being piss-drunk or stoned out of your mind to being afraid of love.

Now, sadly, it seems that this music has changed, as well as the Green Day image we all know and love. Since when have they swapped ratty old blazers and jeans for tight black pants and pyramid belts? We miss the old Green Day, even though their new music isn't too shabby.

2) A full 24 hours spent smoking marijuana.
1) Billie Joe Armstrong, Mike Dirnt, and Tre Cool are the 3 members of Green Day. Currently, they also have Jason White- backup guitar, as well as other various musicians who help them play. They're quite rad.

2) God, you're really fuckin' lazy! You've had two green days in the past month. Get a job or something, you sad-ass.
by ska-o-riffic! April 09, 2005

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