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1.
Someone that enjoys doing things indoors, including video games, using the computer, or just watching TV. People usually think indoor kids are awkward or anti-social or out of shape but that in fact is not true. Indoor kids enjoy hanging out with others just indoors. Usually indoor kids start being indoor kids from a very young age.
A: Hey, man wanna go rock climbing?
B: Nah, lets play call of duty instead. You know im an indoor kid.
by OriginalFuzz August 08, 2011
 
2.
Someone who doesn't get out in the sun very often. Commonly seen transferring TI-83 calculator games to each other at lunch and communicating via PalmPilot, indoor kids have a tendancy to favor more lethargic activities including video games, coughpotatoeing, etc.
Hey, look at that lunch table. It's Schram and her cronies chatting with each other with their PalmPilots.
by Apu September 28, 2004