joker

/ˈdʒoʊkər/
noun
  1. A person who tells jokes or acts in a funny way.
    • The class joker got in trouble for making jokes during the test.
    • My uncle is such a joker; he always has us laughing at family dinners.
    • She's a natural joker, able to make anyone smile.
  2. A playing card that is used in some games, often as a wild card that can represent any other card.
    • The deck includes two jokers, usually with colorful designs.
    • In this game, the joker can be used as any card you need.
    • He won the round by playing the joker at the perfect moment.
  3. A person who is considered annoying or untrustworthy.
    • A joker tried to sell me a fake watch on the street.
    • Don't let that joker borrow your tools; he never returns them.
    • Some joker in the office keeps stealing my lunch from the fridge.