Definition of bum adjective from the Oxford Advanced American Dictionary

     

    bum

     adjective
    adjective
    NAmE//bʌm//
     
    [only before noun](informal)
     
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  1. 1of bad quality; wrong or useless Her campaign has really gotten a bum rap (= has been described in an unfair way) a bum deal (= a situation where you do not get what you deserve or have paid for)
  2. 2injured or not functioning correctly My bum knee keeps me from playing tennis.
See the Oxford Advanced Learner's Dictionary entry: bum