Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun US, vulgar, slang A person marked by stupidity or foolishness.
  • adjective stupid, foolish

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a stupid person; these words are used to express a low opinion of someone's intelligence

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

dumb +‎ ass.

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