Read the dictionary definition of joker. All definitions for this word.
1. a playing card that is usually printed with a picture of a jester
2. an inconspicuous clause in a document or bill that affects its meaning in a way that is not immediately apparent
1. when I demanded my money he showed me the joker in the contract
3. a person who enjoys telling or playing jokes
4. a person who does something thoughtless or annoying
1. some joker is blocking the driveway