obvusly
Obvusly is when you're so sure something is stupid that you don’t even need to explain it, you just throw 'obvusly' at them like it’s a punchline.
Your teacher asks why no one did the homework, and you say, 'Obvusly.'
Your friend says they’re going to be late, and you say, 'Obvusly.'
Your brother says he’s going to win the game, and you say, 'Obvusly.'