joker Meaning, Definition & Usage

  1. noun a person who enjoys telling or playing jokes
    jokester.
  2. noun a person who does something thoughtless or annoying
    turkey.
    • some joker is blocking the driveway
  3. noun 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. noun a playing card that is usually printed with a picture of a jester

WordNet

Jok"er noun
Definitions
  1. One who makes jokes or jests.
  2. (Card Playing) See Rest bower, under 2d Bower.

Webster 1913