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1.
A loose cannon or a chicken or a scaredy cat.
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
 
2.
"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 30, 2013
 
3.
sexy young male, boyfriend, stud, stud muffin, lover
He's my laddybuck. Wow, look at that laddybuck.
by Moonyen May 19, 2011