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1.
Someone who visits wikipedia.org to find out whether a young celebrity is over the age of consent and therefore old enough to perv on.
You are such a wikipaedo, looking up Miley Cyrus, she's only 15!
by Joe-G September 17, 2008
 
2.
Writing false information on Wikipedia to mislead the world and generally abusing the website which people are trying to use to cheat on their homework

Used in a sentence: "Did you see that new Ruler of france on Wikipedia?" "Oh I heard that was just a Wikipaedo" "Shit, I've failed my Modern Studies essay"
by DanirulerofFrance October 23, 2010
 
3.
A lonely male who looks up the history and images of former child stars on wikipedia for kicks.
Did you see that guy outside the comic book fair, what a freak, he's probably a wikipaedo.
by ccdrake September 23, 2008