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jackass (n.)

"male ass," 1727, from jack (n.) + ass (n.1). Contemptuous meaning "stupid person" is attested by 1784 (Ignatius Sancho). Related: Jackassism (1837, American English); jackassery (1833).

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Definitions of jackass from WordNet

jackass (n.)
a man who is a stupid incompetent fool;
Synonyms: fathead / goof / goofball / bozo / goose / cuckoo / twat / zany
jackass (n.)
male donkey;
Synonyms: jack
From wordnet.princeton.edu