Punk band from Oakland, CA that are one of the best from there genre. they were formed in 1987 under the name Sweet Children, they released a few EPs and in 1990, they released 1039 smoothed out slappy hours, it was on an indie label and didn't do so well, but in 1992, they released Kerplunk! which sold Gold, which was rare for a indie album. After that they were signed to reprise records, and released Dookie in 1994.Dookie was very famous,and spawned 4 hit singles, and sold diamond(over 10 mil copies).a year later they released Insomniac which was darker than Dookie but still a hit, although it only sold 2x Platinum. later in 1997 they released there 5th album Nimrod which spawned Good Riddance (Time of your life) a very huge hit song.they released Warning in 2000, international superhits in 2001, and shenaniginas, there b-side album, and there popularity went down. until American Idiot came out in 2004, it held there first Hot 100 singles, and sold 5x Platinum (There 2nd best selling record) after a long hiatus from music they returned with 21st century breakdown in 2009,which has sold gold so far. Hopefully Green Day will go down as one of the best bands ever...Green Day is also a day where you smoke weed the whole day,which is where Green Day got there name from.
Person 1-Who are Green Day?
Person 2-WTF? how in the hell do you not know who Green Day is?

Person 1-A had a Green Day last week
Person 2-So did I
by Raw Faith December 03, 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
Californian punk rock band. Includes Billie Joe Armstrong, Tre Cool, and Mike Dirnt. They formed together in 88 and released their first album in 1991. They became famous for thei album Dookie in 1994, but really hit hard with their 1997 single Time of your Life from their album Nimrod. Also, the GREATEST BAND EVER!
"Green Day rocks!!"
"Dude, I TOTALLY agree!"
by Fini August 08, 2004
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