1. Someone who probably spends way too much time "stumbling" on the website Stumble Upon
2. Someone who gets extreme, almost narcotic pleasure from searching the web randomly via a trained/custom program like Stumble Upon
3. Yo mama.
Sam is such a Stumblebum! I wish she'd quit junking up my Facebook
wall with that weird $#*!
© 1999-2015 Urban Dictionary ®
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