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What is Cockney rhyming slang? "use your loaf"

Rhyming slang is a form of slang in spoken and written English in which a word is replaced by a rhyming word, typically the last word of a two- or three-word phrase with the effect that the meaning of the spoken or written words is not obvious to receivers who are not familiar with the code.[1] Examples that are frequently quoted include "frog and toad" meaning "road", and "apples and pears" meaning "stairs". The part of the coded phrase that rhymes with the original word is typically, but not always, omitted to further strengthen the code,[2] as in "I’m going up the apples" to mean "I’m going up the stairs".

(Wikipedia) 

 Some examples:

English	Rhymes with	Cockney
Feet	Plates of meat	Plates
Teeth	Hampstead Heath	Hampsteads
Legs	Scotch eggs	Scotches
Eyes	Mince pies	Minces
Arms	Chalk Farms	Chalk Farms
Hair	Barnet Fair	Barnet
Head	Loaf of bread	Loaf
Face	Boat race	Boat race
Mouth	North and south	North and south

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