rhyming slang
From Longman Dictionary of Contemporary Englishrhyming slangˌrhyming ˈslang noun [uncountable] British English SLa way of talking, used especially by cockneys (=people from east London), in which you use words or phrases that rhyme with the words you mean, instead of using the normal words. For example, ‘plates of meat’ is rhyming slang for ‘feet’.Examples from the Corpusrhyming slang• Anne: In cockney rhyming slang what is tomfoolery?• I'd be doing rhyming slang if I didn't watch out.• I remember thinking that use of rhyming slang was going to help clear matters up in no time.