Poutine certainly isn’t healthy, but it’s delicious.
As my daddy used to say, “One man’s meat is another man’s poison.” 
Did he eat beaver (the animal, you pervs!) during Lent?
If he did and was French Catholic, he could say that “One man’s meat is another man’s poisson.”
Very clever! LOL
The Coney Island Dog has always made me shudder, not that it’s a national dish, but it qualifies as: “A real Red Blooded American Meal, I tell you what.”
I don’t even see what would be objectionable about poutine. It’s just really heavy. But potatoes + cheese + gravy? What’s not to like?
In Scotland there is the deep-fried Mars chocolate bar. But I suspect they invented that as a joke on credulous tourists?
Pretty much. Most Scots disavow the thing. They’d much rather be known for mixing the inedible parts of a sheep with the inedible stuff a sheep eats then stuffing it into said sheep’s stomach and boiling it up like a giant banger.
I don’t blame them - deep-fried Mars bars are nasty!
I don’t know where my brain was a year ago, but this is annoying the crap out of me that I spelled it wrong. It’s lángos. The accent is over the “a”, not “o.” It just leapt out to me on re-reading this thread. Such a weird mistake for me to make, but, hey, welcome to middle age, I guess.
My daughter insisted on trying one when we were in Edinburgh a few years ago. I - think - she ate it all, but she never asked for another… 
Some places around here offer a chunk of French bread dipped in Italian beef gravy for a couple bucks. This gravy is more brothy than most and pretty much just makes a salty, soggy piece of dough. Still, it’s occasionally ok when you’re still hungry but not enough for a whole sandwich. They’re called juicy or gravy bread.
How 'bout Frito pie with Wolf chili? 
I have a friend who is a food writer and every year does an article of what foods are found at the Texas State Fair. One year she tried the dep fried bubble gum. I can sort of see the others such as deep fried beer or deep fried cookies (not that I would eat them) but bubble gum with breading trapped in the gum is an abomination.
Now we’re talkin’! Walking tacos, pepper bellies…whatever you call them, they are delicious and a staple at proper fairs. Wolf chili rules.
I’ve never had the full English, but the Scottish version, at least as served by the landlady of the B-n-B I stayed in in Edinburgh, was a superlative start to the day, and one of Scotland’s glories.
Beck is going to take you down for that! ROFL!
I’m also Scottish (though I left when I was 18 months old, and grew up in England) and have eaten one .
I would say that per-capita there are probably less deep fried Mars bars consumed in Scotland than beans on toast or chip butties in the rest of the UK.
Ok, then. Maybe, S.O.S. or stuff that originated in “Lean” Years and cheap eats. My favorite, is our regional “Ringliver Sausage” with eggs and toast. “Ringleberwurst”. It’s colon encased livercand groats , that is peeled from rubbery ring intestinal encasement and fried crispy served on yolky eggs over buttered toast.so simple but good. Used to be supet chesp… but now since the pandem8c it prices me out since tbe eggs and specialry meat/charciterie.
Mars bar FYI: What the UK and most of the world know as a Mars Bar (chocolate bar with nougat and caramel, coated with milk chocolate) is called a Milky Way bar in the U.S (though they differ a little). What Americans call a Mars bar is darker and has nougat and toasted almonds covered in milk chocolate.
But, deep-frying either version of a Mars bar (or a Milky Way bar) sounds horrible. 
Not helped by the fact there’s a UK bar called a Milky Way as well which is a mars bar without the caramel.
I can’t find the exact name, but I’m sure they called Mars Bars something different in Switzerland (and perhaps in EU) in 1989, we were over on an interrail thing. Something like Galaxy (it was then we saw Snickers vs Marathon).