joker - definition and synonyms

noun [countable] 

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  1. 1
    someone who likes to tell jokes or to do things to make people laugh

    He’s a real joker.

  2. 2
    informal someone who does something that you think is stupid

    Some joker left his car in my parking space.

  3. 3
    a type of playing card with a picture of a jester on it that is used in some card games