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1.
Wearing unintelligent jewelry
Seriously dude? Wearing a 24 carat gold chain with your hoodie? Stop dumbling...
by ju13s January 19, 2012
 
2.
a gentle, endearing, insult for someone, in a temporary state of unintelligence, causes mild annoyance or frustration.
Neeharika starts eating dumplings with a fork and knife. "Neeharika, don't be such a dumbling."

Samiksha suggests that New York life is better than San Francisco life. "Dude, that's such a dumbling thing to say!"
by pkmax October 19, 2014