Factotally
When something is so true it might as well be carved into your bones and shouted at you by a angry god
I told my mom the sky is blue and she said I was right, but I know it's factotally true because I've seen it with my own eyes and my eyes are not lying.
My dog ate my homework and I'm factotally sure it was the best decision he ever made.
The fact that my teacher doesn't know how to spell 'factotally' is factotally embarrassing.