This is very different. I am careful with what I say with certainty and what I ask or try to discuss. A tshirt and a shirt aren't necessarily the same, but it is common in American English to say "shirt" for any shirt, including a tshirt. Not all shirts are tshirts, but all tshirts are shirts, so the terms are often used interchangeably unless it is important to be specific.
People are lazy, we don't like to use extra syllables. That is why people usually say TV or fridge.
A hearty meal of fried food - typically (but not always) for breakfast. Almost any combination of eggs, bacon, mushrooms, sausage, tomato, maybe some black pudding, and often whatever old leftovers from the night before (like bubble and squeak — to the uninitiated, cooked cabbage or sprouts mixed together with mashed potato and re-fried with a big knob of butter). Some people put baked beans with it, but this offends purists! In Scotland there may be haggis; in Ireland maybe white sausage instead. Universally served with stacks of bread and huge mugs of tea. (And you wonder why the Brits are so fat?!)