Wiktionary
darn tootin'
a. 1 (context chiefly US countrified idiomatic English) absolutely correct; speaking the truth. 2 (context chiefly US countrified idiomatic English) absolute, utter, complete, very. adv. (context chiefly US countrified idiomatic English) assuredly, absolutely, utterly, completely. alt. 1 (context chiefly US countrified idiomatic English) absolutely correct; speaking the truth. 2 (context chiefly US countrified idiomatic English) absolute, utter, complete, very. interj. (context chiefly US countrified idiomatic English) You are absolutely correct.