"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")
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.
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.