They will say "the carbs you dont burn off turn to FAT"
Even, your thread mis-states the nature and relationship of carbohydrate type and what ever you may "mean" by FAT.
The problems lie with understanding that science is an exacting discipline - and using slang terms like "carb" is as misleading as a headline from any run-of-the-mill magazine article.
This thread's already off in three directions, most comments misrepresenting the relative importance of several interconnected processes.
Of course, actually framing a discussion to a single pertinent context, and using terminology with respect to its strictest, most specific meaning would be considerably much harder. Muddle on.