Definition of knock-knock joke noun from the Oxford Advanced Learner's Dictionary

 

knock-knock joke

 noun
noun
BrE
 
; NAmE
 
 
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a type of joke that depends on the way in which some words in English sound like other words. The person telling the joke says ‘Knock-knock’, someone answers ‘Who's there?’, and the first person says a name which isn't what it seems. A typical example might be: ‘Knock-knock.’ ‘Who's there?’ ‘Lucy.’ ‘Lucy who?’ ‘Lucy Lastic (= loose elastic).’