Jimmy Horner
What's the meaning of the phrase 'Jimmy Horner'?
A corner.
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What's the origin of the phrase 'Jimmy Horner'?
This is not one of the more commonly used examples of Cockney rhyming slang, but it is still in active use in London and the South-east of England. A 'horner' is a slang term for a man who cuckolds another, although it isn't clear if this is the source of the name.