What is Garbage Day?
1.
A day of death (either your own or somebody else's, metaphorically or literally). It can be said as part of trash talk or more fittingly as a war cry or victory cry.
The phrase is usually said without pronoun and is followed by a maniacal (although not hysterical) laugh. It is a reference to a non-intentionally hilarious scene in the shitty 1987 film 'Silent Night, Deadly Night II.'
Dead guy: Dude, you shot me by surprise, although I did have enough time to stand around and shout "huh? no!"
Murderer: GARBAGE DAY! *shoots to kill, then looks at gun with new found admiration* Muha-ha ha-ha-ha.
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2.
Scene from a crappy horror movie sequel called "Sillent Night, Deadly Night II." It is unintentionally hilarious because of poor acting and poor writing.
It has become a popular Internet meme, often featured in Youtube Poop videos.
A man is taking out the trash. He picks up a can, and on the other side is the killer.
Killer: GARBAGE DAY!!
Man: Huh?
Killer: *raises gun*
Man: No!
Killer: *shoots*
Man: *is shot and flies backwards, tossing the can and garbage* *moans*
Killer: *laughes manically and twirls gun* *blows smoke off* *laughes again and walks away*
See