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22.
1. A day spent smoking weed, usually out of boredom.
2. A pop-punk band formed in 1988, with many good songs out like "When I come around", "Time of Your Life", "Why do you want him?" and more. I discovered them in 5th grade when hearing Boulevard of Broken Dreams on the radio. I looked them up and, well, fell in love with their old stuff as well as new (but preferring pre-American Idiot). But then, I discovered something in 6th grade called real punk. I really got into The Stooges, The Ramones, The Clash, Misfits, Sex Pistols, etc. A year later, I listened to American Idiot for the first time in years and came to a conclusion: that (new) Green Day, while being pseudo-punk and somewhat annoying, is a pretty unique band. Compare them to the other stuff that's out today!

HOWEVER, Green Day started an epidemic of a new breed of poser. It's when someone aged 8-13 believes they are "seeeeew punk rawk" when they listen to Green Day, Blink 182, or Avril Lavigne. They oftentimes don't even know who the bands I mentioned previously are. Those who like Green Day are often seen bashing Bush without even knowing if or even why he is a bad president. Now, not everyone who listens to said music is this way, just a vast majority. Not saying bad things about everyone who likes Green Day, just those who listen to them only and try to be something they're not. To conclude, a decent band.
1. Jimmy's so baked. It's definitely a Green Day...
2. Actual conversation:
Poser in my class: I just love Green Day omg!
Me: Do you listen to anything else??
Poser: Well my favorite artist is Avril Lavigne. It's just pure punk rock!
Me: Dude, thats not punk. Have you even heard of the Ramones? The Clash? The Sex Pistols?
Poser: Well, I havent heard of the Sex Pistols or the Clash. But the Ramones are gay!
Me: -rams head into wall repeatedly-
by Rachel_isapunkrocker May 17, 2008
 
1.
A day spent smoking marijuana.
Saturday was a green day.
by Anonymous September 18, 2003
 
2.
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
 
3.
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
 
4.
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
 
5.
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
 
6.
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
 
7.
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