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1.
Porky pies rhymes with lies - Cockney rhyming slang.
You tellin' me porky pies?
You tellin' me porkies?
by Karan "Pin" Saroj December 09, 2004
 
2.
Cockney slang for "lies"
"Don't be telling me porky pies!" which, translated, means "Don't tell me lies!!"
by Debs September 15, 2005