"Laddybuck" is slang, and slightly insulting. A "lad" is a boy, and a "buck" is a young horse... so, laddybuck is "a young boy with bad manners, like an untrained horse."
"I'd pull yourself together, laddybuck," Wilson said very quietly. (Ernest Hemingway "The Short Happy Life of Francis Macomber")
by Khnyka July 31, 2013
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From Hemingway's "The Short Happy Life of Francis Macomber":

"I'd pull yourself together, laddybuck," Wilson said very quietly.
by Old Bug-eye September 20, 2009
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An arrogant hillbilly in their late teens or early 20's. Also referred to as a half-raised hillbilly. One who thinks they know everything when in reality they don't know shit.
Glad to see you made it to work laddybuck.
by JayDawg1980 May 1, 2020
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sexy young male, boyfriend, stud, stud muffin, lover
He's my laddybuck. Wow, look at that laddybuck.
by Moonyen May 20, 2011
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