If something happens that is unexpected in a game it is a bug or a glitch.
If you use that bug or glitch to your advantage, it is then an exploit and you are cheating.
I don't care if you "seriously got Roadhog by total accident and didn't press anything", if you *** hook me out of my goal and kill me, you will be *** reported and I will tell everyone in the match how and why they should report you.
And then you get trapped due to teleporter clipping while I sit there and watch.