A noun used to represent dumb or slow people. Also can be used as an adjective.
"You are a serious dumby."
"Hey you dumby jerk, why are you taking my car?"
by $tefen September 2, 2006
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A portmanteau of the words dumb and dummy.
Can describe someone who is stupid, jokingly or not.
ur a dumby!
by GrillSalt May 13, 2016
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A verb meaning "very", the preppy version of the term dumb.
I was dumby tired during math class, so I fell asleep.
by KissTheStars December 10, 2006
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