joker

noun

1. A person who makes jokes.

2. slangA funny person.

3. A jester.

4. A playing card that features a picture of a joker (that is, a jester) and that may be used as a wild card in some card games.

5. An unspecified, vaguely disreputable person.

   “Some joker keeps throwing eggs at my windows.”

6. New ZealandcolloquialA man.

7. A clause in a contract that undermines its apparent provisions.

8. militaryA friendly unit that acts as a suspected hostile unit in a military excercise.

9. A person who enjoys telling or playing jokesperson

   Similar: jokester

10. A person who does something thoughtless or annoyingperson

    “some joker is blocking the driveway”

    Similar: turkey

11. 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”