Noun
knock knock joke (plural knock knock jokes)
Alternative spelling of knock-knock joke
Examples
knock-knock joke (plural knock-knock jokes)
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.)
knock-knock joke