Common misspelling of the word dummy, almost always used by the people who can easily be described by the word itself. Just because dumb has a "b" at the end, does not mean dummy has to. Also, dummy does not rhyme with Gumby.

thick and voluptuous; a short term for dumby thick

a person who is the opposite of smart

my friend gage

A noun used to represent dumb or slow people. Also can be used as an adjective.

A portmanteau of the words dumb and dummy.
Can describe someone who is stupid, jokingly or not.

A verb meaning "very", the preppy version of the term dumb.