You bet your sweet patootie

Best definition
You bet your sweet patootie
It means the same as the phrases, “you bet your ass” and, “you bet your dick and balls”.
That is, you’re absolutely, positively, 100% certain about the final outcome of a situation.
{Seen on a website about flashlights, LEDs, and lasers}:

I tried to cut through the outer casing to bare metal with the blade of a Swiss army knife, and with some minor difficulty, I was able to do so. This shows the unit has a Type II anodized finish to it (…)

Would I really cut up a brand spanken new $450.00 laser? You bet your sweet patootie I would, if it’s in the name of science.