My absolute favorite was the one my grandfather used to tell me, he would say "Boy if your gonna be dumb, you gotta be tough and you are, by far, the toughest kid I know" I love the back-handedness of the insult.
The other one that I think is funny is due to Tombstone most people think it is: "Im your huckleberry" when in fact the correct term is "I'll be your huckle bearer" which is the equivalent of a pall bearer, in the south we call the casket handles huckles. The term basically means keep it up and you are going to get the fight you are looking for.
Not the term, a term. They're different idioms with completely different meanings, both well-attested historically. "Huckleberry" is not a corruption of "huckle bearer" here or anywhere else.
Doc Holliday isn't quoted as having ever said the phrase, by the way. It's taken from historical fiction, in a context where "I'm your huckleberry" -- "I'm game", "I'm up for it", "I'm your guy" -- makes far more sense.
"They say you're the gamest man in the Earp crowd, Doc," Ringo said. "I don't need but three feet to do my fighting. Here's my handkerchief. Take hold." Holliday took a quick step toward him. "I'm your huckleberry, Ringo," replied the cheerful doctor. "That's just my game."
https://www.google.com/books/edition/Tombstone/4PnFRfNtyhYC?...
This simply isn't true. It was a common phrase and is widely attested in texts from Holliday's lifetime.
You originally said:
> due to Tombstone most people think it is: "Im your huckleberry" when in fact the correct term is "I'll be your huckle bearer"
I'm not arguing that "huckle bearer" wasn't also a common phrase. It's just not the "correct term" here. There's no basis for the idea that "huckleberry" was either a misquote or a corruption of "huckle bearer". Both the immediate textual context of the novel and the broader historical evidence for the phrase clearly establish otherwise.
The movies use of them was actually well played as Holiday was from Georgia and would have shared many of the colloquialisms that where in use in the deep south of Florida, Alabama, Mississippi, etc.
"Faster'n a pack o' dogs on a three-legged cat"
The equivalent deep south colloquialism for that would be: faster than a raped ape. I don't exactly understand why apes are so fast when they are raped but apparently they are fast. The other one I hear, but not as much, is faster than a knife fight in a phone booth.
One of my other favorites that is tangentially related is:
Ya'll cover your ass faster than the new guy on D'block.
Ironic, considering the highly phonemic orthography of Castilian.
Anyways somehow there became this competition among them to learn and use the most obscure American English colloquialisms and use them in meetings. One of them the CTO for Spain became a very good friend of mine and we decided to start teaching him some words so he could win in these competitions.
With that said I am from a rural town in the US southeast (Florida to be specific). Needless to say he learned a lot of obscure US country colloquialisms. I can still remember the look of wordsmithed defeat by the other executives when he declared, in a meeting, that they where carpetbagging hornswogglers for deciding something without him. I have to say I nearly fell out of my chair with laughter in seeing how impressed with himself he was. The meeting quickly devolved into defining what was a carpetbagger and what was being hornswoggled, as well as requests for other words in which my friend declared that they need to get their own US mentor and not steal his. I was all good fun.
I also learned some Spaniard ones. My favorite which I could not spell out here to save my life, was one that amounts to the equivalent of monkey business.