Meanings
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1
noun
informal and insulting: a foolish, stupid, or badly behaved person
Do not be a jackass and ignore the warning signs.
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2
noun
a male donkey
The farmer kept a jackass with two female donkeys.
Thesaurus
Etymology
A compound of jack, a traditional word for a male animal, + ass, 'donkey.' The insulting human sense developed by metaphor from the donkey's old stereotype as stubborn or foolish.