Definition of ass noun from the Oxford Advanced American Dictionary

     

    ass

     noun
    noun
    NAmE//æs//
     
     
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  1. 1 (slang) an impolite word for the part of the body that you sit on; your bottom Get off your ass (= stop sitting around doing nothing).
  2. 2 (informal) a stupid person synonym fool, jackass Don't be such an ass! Imade an ass of myself at the meeting—standing up and then forgetting the question.
  3. 3 (old use) a donkey
  4. Idioms
    kick ass/butt(slang)
     
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    (impolite) to succeed or win in an impressive way Let’s show them that we’re ready to kick some ass!
See the Oxford Advanced Learner's Dictionary entry: ass