[you bet] or [you bet your boots] or [you bet your life] {informal} Most certainly; yes, indeed; without any doubt. — Used to declare with emphasis that a thing is really so.
* /Do I like to ski? You bet your life I do./* /You bet I will be at the party./* /You can bet your boots that Johnny will come home when his money is gone./
Compare: BET ONE'S BOTTOM DOLLAR.