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A person or thing who thinks he is brighter than he is. Or, one who would like to be brighter than he is. Flat Champagne.
The Vice-President of the Condo is a dim bulb. We call him Dimmy. The only Champagne he drinks is flat like a dim bulb.
by Knockings July 11, 2011
a very stupid person
Gary must be the dim bulb in that group.
by familyguy April 26, 2005
a witless one
humorless and without remorse
a broken unit
he's just a dimbulb.
that is all.
seriously now
by dimbulb October 30, 2003