A Geordie lad gets off with a Sheffield lass. He drops his pants, gets his cock out and the lass says: "Bye eck, that's a gud un". He says: "What's a gud un?" She replys: "It means a big one".
She drops her knickers and he says: "Bye eck, that's a canny un".
She says: "What's a canny un?"
He replies: "A fucking big valley that cowboys ride through".