Top Definition
being so addicted to tumbr that you can't stop and your social life goes down the drain.
Annie: OH MY...i think i have tumblr-itus
Casey: WTF
Annie: you not going out anymore, my hands are glued to the mouse pad...i can't stop making jokes only people with a tumblr can i keep writing this: "la;ksjlkj" and correcting people when they write "your" when they mean "you're"
Casey: and when does this disease end?
Annie: never c:
by June 21, 2011

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