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1. A person who enjoys telling or playing jokes
   - jokester, funster [informal], wisecracker, quipster
    
2. A person who does something thoughtless or annoying
   "some joker is blocking the driveway";
   - turkey [informal]
    
3. An inconspicuous clause in a document or bill that affects its meaning in a way that is not immediately apparent
   "when I demanded my money he showed me the joker in the contract"
    
4. A playing card that is usually printed with a picture of a jester

Derived forms: jokers

Type of: article, clause, comedian, comic, disagreeable person, funnyman, playing card, unpleasant person

Encyclopedia: Joker