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1.
Flash cartoon series featured on Newgrounds.com and FlashPlayer.com

Starting life as a Devil May Cry parody, "Decline of Video Gaming" expanded into a largely popular series about all sorts of video games and developers.
user321: Dude do you know when the new Decline is gonna be out?

user876: Dunno, but if it were possible to camp outside Newgrounds overnight, I would.
by FlashBrosDim April 27, 2005
 
2.
The theory that states all phillipino girls become uglier after the age on 21.
Dave: Dat dere phillipino girl hit the decline hard
by jdrizzzzy September 28, 2010
 
3.
An exclamation used to express disapproval, disgust, and/or a refusal to a request. Commonly has emphasis on the first syllable.
Me: I failed that chemistry exam from last week.
Friend: Decline! Can you make it up?
Me: No...
Friend: Double decline!

(emphasis on the first syllable in the following example)
Me: This fnasty guy hit on me on the train today.
Friend: DEEEcline!
by Susie P May 25, 2009
 
4.
The best song EVER.... by NOFX
EIGHTEEN MINUTES
I pity the fool who has to play a song for 18 minutes... but NOFX is awesome
by Batman February 15, 2004