'doofus' definitions:

Definition of 'doofus'

From: WordNet
noun
A stupid incompetent person [syn: dimwit, nitwit, half-wit, doofus]

Definition of 'doofus'

From: GCIDE
  • doofus \doo"fus\, n. a person who is stupid or inept; -- used contemptuously. [Also spelled dufus.] [Slang]
  • Syn: dingdong, ding-a-ling. [PJC]