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The act of using stumble-upon to find pictures to post on your tumblr account.
I was totally stumblring and found a picture of a cat with a hat!
by RadishDog123456789 January 20, 2011
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someone who is a stalker on tumblr, one who stalks other tumblr accounts and claims that he/she happened to stumble across a tumblr account accidentally.
friend: why are you always checking out his account?
stumblr: no, i accidentally clicked on his account

friend: what, you clicked on his account for 20 days straight "accidentally" , you're a stumblr
by _kickinthedick June 01, 2016
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