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A society within the Tumblr micro-blogging website that shares common interests.
Girl A: "Hey, you like Assassin's Creed right?"
Girl B: "Duh, I pretty much started the AC tumblrhood."
by Edamessiah September 05, 2011
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1. A group of individuals within the micro-blogging site Tumblr that combine to form a close-knit family and share their mutual appreciation and passion for the video game franchise from Ubisoft called Assassin's Creed, including the use of fan art, fan fiction, and other fan media.

2. The Assassin's Creed fandom on Tumblr.
The Tumblrhood is the best group of people I've ever met.
by Lady Boots October 27, 2012
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