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1.
The hour set aside during the last weekend in March during which businesses and households worldwide are encouraged to turn off all unnecessary electricity to promote awareness of global climate change. Furthermore, earth hour allows an observer to engage in various activities that would cause shame or embarrassment if the lights were on. Activities including, but not limited to, being featured on failblog, yacking in front of that hot guy/girl you want to bang, and coitus with extremely unattractive individuals are pardoned. After all, epic fails and party fouls are completely justified if committed during an attempt to save the world.
Person A: "Dude, please tell me you didn't bang that chick you brought home last night. She looked like a mangy troll."
Person B: "It was earth hour. Don't you care about the world."
Person A: *hangs head in shame*
by sdreed March 27, 2009
 
2.
-Noun- One hour at the end of March, during which, people who don’t believe that the human race is a virus and know that man made global warming is a load of manure, celebrate technology. We celebrate by turning on all lights in our homes (those of us with mercury laden, curly-cue light bulbs replace them with incandescent bulbs), turning on as many power-draining electronic devices as we can, running our SUVs in neutral with a brick on the gas pedal, burning Styrofoam effigies of Al Gore, Phil Jones, Jane Lubchenco and other climate liars.
Q: So, how was your earth hour?
A: pretty good but i feel like i got black lung from all that burning styrofoam!
by kas96b March 27, 2010
 
3.
An excuse for everybody to get drunk and stumble around avalon
"dude earth hour was soo good yesterday"
"yeah i got wasted and passed out on the beach"
by Dommay2097 March 29, 2010
 
4.
instead of earth day, earth hour, a day we tell the earth, Hey we're just not that into you
earth hour, 23 less hours then earth day
by jon12345677654321noj March 28, 2009