from German "Keller" = cellar & "Kind" = kid.
Refers to a person who always sits in their room in darkness, often in front of their computer, and has pale skin.
Person A: I've never seen Fred outside his house. And dude, have you seen his skin!?
Person B: ikr, he's such a Kellerkind.
by Kellerkind93 June 03, 2011

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