Top Definition
a website where people share their websites and send the pages they visited to each other
Man i was on this cool as site just now!I sent it to you on stumbleupon,you got it yet?
de stevoo0011 27 juillet 2006
A tool for Mozilla Firefox that is used for trolling at the speed of light.
I use stumbleupon every day! In fact, I use it a thousand times a day!
de That One Italian 22 juin 2010
stumble across, to encounter or discover (someone or something) by accident
after 28 yrs of mis direction i stumble upon taoism n it changed my life forever!
de annua 8 août 2009
(N) 1. Stumbleupon is an internet sea of feminine passive-aggression, trolling and insanity. An ideal forum for internet tough guys, pretentious bitches, would be political pundits, old women and shitty poets to sound off. Members of the 'core forums' aren't well known for having much going on with respect to interpersonal skills, as is evidenced by their endless hours spent online.

2. A place for douche bags too old for 4chan to hang out.

3. A web browser utility used for trading kittens photographs, smut, and astronomical photos amongst 'friends', who are generally people you wouldn't spend a minute with in real life.
I joined Stumbleupon, but hated the experience. It's like facebook for wordy douche bags.
de Riddlze 1 novembre 2009
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