Meaning

• A person who makes jokes.

• A funny person.

• A jester.

• 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.

• An unspecified, vaguely disreputable person.

  "Some joker keeps throwing eggs at my windows."

• A man.

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