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1. The act of receiving a large number of thumbs down ratings and bad reviews on a submission to StumbleUpon.
2. Being in some way damaged by excess stumbling (loss of job, girlfriend, track of what day it is, etc.)
"I'm really getting sick of people claiming that goddamn tree in Disney world is either a real tree or not in Disney World, but I love seeing it get stumbleupwned so badly."
by David Davids0n September 04, 2008
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