Definition of reefer noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈriːfə(r)//
    ; NAmE NAmE//ˈriːfər//
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  1. 1 (also reefer jacket) a short thick jacket made of wool, usually dark blue, with two rows of buttons
  2. 2(old-fashioned, slang) a cigarette containing marijuana
  3. Word Originsense 2 1930s: perhaps related to Mexican Spanish grifo ‘(smoker of) cannabis’.
See the Oxford Advanced American Dictionary entry: reefer