Garbage Kids are people who are really bad at Halo 2. They are "garbage" at Halo 2. You wouldn't direct the term at a garbage kid, you would use the term when talking about them.
(When winning a Team Slayer game by a lot)

Mikuz 2: These are some garbage kids.

So Original v1: I know, Im on a running riot.
by Mikuz August 12, 2009
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A set of bubble-gum card stickers produced by Topps Chewing Gum that spoof Cabbage Patch Kids, all the rage in the 80s. They feature pictures of disgusting versions of the dolls with equally disgusting nicknames. Concept based on Wacky Packages.
Garbage Pail Kids are making a comeback.
by Wacco February 7, 2004
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A. an insult branded to anybody who is deemed extraordinarily terrible at something.
B. Can be used to describe a professional athlete who is under performing.
C. The WNBA
"Drew never wins when we play scrabble. He's so bad he can barely crack the hundred mark."
"Good lord, he's such a garbage can kid"
by Pigpenamus December 17, 2009
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A dirty bitch that you would not take home again... or at least not until after 2:30am when there was nothing else to choose from.
guy #1 "I think I'm going to ask Robin out."
guy #2 "She a Garbage Pail Kid... better wrap it up!"
by Mr. Ahole June 10, 2004
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a GPK (a Garbage Pail Kid) is a sexual act in which one person penetrates the other up their butt, while holding their head in a bucket, or other large container, of vomit.
This girl I dated was into vomit, and last Tuesday, she asked if I'd give her a GPK (a Garbage Pail Kid).
by youppi November 17, 2011
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