rhyming slang

noun

1. a form of slang in which a rhyming word or phrase is substituted for the word intended, as Kate and Sidney for steak and kidney or khaki rocks for army socks.
2. a further removal from the original word intended by ellipsis of the rhyming part, as titfer for tit for tat for hat.

noun

1. slang in which a word is replaced by another word or phrase that rhymes with it; for example, apples and pears meaning stairs