Oh, this is so fun!

I hate it when people use "literally" as emphasis. "I literally had a ton of homework" means "I had a ton of homework", period. It is no longer hyperbolic if the word "literally" is used, so it doesn't belong unless you really mean it!

"Irony" is also frequently used incorrectly, and so are "like", "like", and "like".

It also bugs me when people confuse "stuff" and "things", or "much" and "many", saying "I have so much things, I don't know what to do with it all," instead of "I have so many things, I don't know what to do with them all."