Definition from Wiktionary, the free dictionary
- One of a class of childish jokes told as a dialog, and usually including a pun, in the following form:
- "Knock knock."
- "Who's there?"
- (The teller of the joke says a name.)
- (The person to whom the joke is being told repeats the name, followed by "who?")
- (The teller of the joke says a pun based on the name.)