"lend me some tin ... I haven't a tosser to my kick" (Kay in The Box of Delights, John Masefield)
Surely you can't entirely disapprove of slang or regard it as necessarily indicative of bad parenting. I think slang grows up naturally whenever a group of people form a partially enclosed group, such as boys at a boarding school. It can involve considerable linguistic creativity, though I don't recall anything from my own old boarding school days quite as elaborate as in Buckeridge:"But if what Bod said is right -- " Jennings began.
"You mustn't call him Bod," said Venables, shocked. "New chaps aren't allowed to call fairly senior chaps by their nicknames until their second term."
"Then his name isn't really Bod, any more than Mr. Carter's name is Benedick," persisted Jennings, who liked to get things straight.
"Of course not," said Venables. "His name's Temple, and his initials are C. A. T. so naturally we call him Dog."
"But you didn't call him Dog; you called him Bod."
"Give a chap a chance to get a word in," said Venables. "I haven't finished yet. It's a bit of a sweat calling him Dog, so we call him Dogsbody for short."
"But it isn't short," protested Jennings. "Dogsbody's much longer than Dog."
"Okay, then, it needs shortening. Bod short for Body, and Dogsbody short for Dog. Really!" Venables shook his head sadly. "You new oiks are dim at picking things up."

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