Top Definition
a person on Facebook who over posts and/or changes status updates on a continuous basis causing your news feed to be inundated with their posts
Penelope was the quintessential Facebookundator, she posted songs and pics once every 5 minutes all day every day.
by Penelope Storm July 18, 2011
One who inundates Facebook with endless posts, videos, photos or links
Cara was known as the ultimate Facebookundator posting nonstop all day, errrrry day.
by Carabear717 May 26, 2011

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