Green’s Dictionary of Slang

tooting adj.

1. correct.

1927		(con. 1914–18) L. Nason Three Lights from a Match 138: ‘Are you able to see, General?’ [...] ‘You’re tootin’ I can see, you damned tailors’ dummy!’.
1933		J. Spenser Limey 144: ‘Wood alcohol, huh?’ ‘Ya tootin’.’.

2. a euph. for damn adj. (1); occas. as adv.

1964		J. Thompson Pop. 1280 in Four Novels (1983) 455: You’re tootin’ well right.
1999		Indep. Rev. 8 Sept. 4: First it was those darn tootin’ cocaine allegations.

In phrases

you’re darn tootin’ (also you’re damn tootin’, ...damned..., ...doggone..., ...durn..., ...goddam...)

(orig. US) you’re absolutely right.

1916		L. Pound ‘Word-List From Nebraska’ in DN IV:iv 273: darn-tootin’, adj. Correct, right. ‘You’re darn-tootin’ about that thing.’.
1922		Bemidji Pioneer (MN) 14 Feb. 6/3: [cartoon caption] ‘I hear yer wife is sick with a bad cold — is that so?’ ‘Yer dern tootin’ it is!’.
1927		(con. 1914–18) L. Nason Three Lights from a Match 167: You’re damn tootin’ I do.
1928		R. Fisher Walls Of Jericho 306: tootin’ Right. Unquestionable [...] ‘You are doggone tootin’.’.
1929		T. Thursday ‘Pay Out West’ in Western Outlaws Dec. 🌐 ‘I hope you are all glad that you listened to me last night!’ ‘Yore darn tootin’, ole timer!’.
1930		R. Whitfield Green Ice (1988) 64: You’re damn tootin’ I am!
1930		J. Lait Gangster Girl 38: You’re doggone tootin’ you’re goin’.
1932		R.E. Howard ‘Night of Battle’ in Fight Stories Mar. 🌐 ‘You mean this man is the infamous Black Mandarin?’ ‘You’re darn tootin’,’ said Johnny.
1934		L. Berg Prison Nurse (1964) 115: You’re goddam tooting there ain’t.
1940		S. Longstreet Decade 83: Yer darntootin’ we won.
1944		C. Himes ‘Money Don’t Spend in the Stir’ in Coll. Stories (1990) 196: ‘The warden would have a word with you. Is it convenient?’ ‘You’re damn tootin’ it’s convenient,’ I say.
1946		(con. 1910s) J. Thompson Heed the Thunder (1994) 222: ‘You really think I did, Jake?’ ‘You’re durn tootin’ you did.’.
1949		(con. 1943–5) A. Murphy To Hell and Back (1950) 69: ‘You’re damned tootin’,’ says I.
1951		S. Lewis World So Wide 105: You’re damn tootin’!
1958		R. Frede Entry E (1961) 158: You’re damned tootin’ not.
1968		‘Richard Hooker’ M*A*S*H (2004) 158: ‘I told you Henry believes in free enterprise, too.’ ‘You’re damn tootin’.’.
1977		R. Coover Public Burning (1979) 412: You durn tootin’!
1978		S. King Stand (1990) 470: And wasn’t he taking care of her? You were damned tooting he was.
1979		S. King Dead Zone (1980) 228: You’re damn tooting.
1982		(con. 1930s–50s) E. Mac Thomáis Janey Mack, Me Shirt is Black 148: You’re darn tootin’ Ma.
1986		S. King It (1987) 263: Dorsey had asked timidly if that hammer was expensive. The old man told him he was damn tooting.
1999		Indep. Mag. 9 Oct. 26: You’re darn tootin’ it is.
2005		Mad mag. Apr. 50: Lickity split! Yer darn tootin’.

In exclamations

damn tootin’! (also darn tootin’!)

(US) a general intensifying or affirmative excl.

1930		J.T. Farrell ‘Looking ’Em Over’ in Short Stories (1937) 44: ‘Damn tootin’,’ said Dan.
1934		(con. 1920s) J.T. Farrell Young Manhood in Studs Lonigan (1936) 206: Damn tootin’, he was quite a guy.
1936		R. Chandler ‘Goldfish’ in Red Wind (1946) 154: ‘Darn tootin’,’ Kathy Horne said pertly.
1951		J. Reach My Friend Irma II ii: Darn tootin’!
1966		D. Ward Day of Absence in Black Drama 206: announcer: You’re laying major blame at the doorstep of the present administration? clan: Damn tooting!
1972		(con. 1916) G. Swarthout Tin Lizzie Troop (1978) 177: Darn tootin’, Dink.
1985		Atlanta Constit. (GA) 3 July 14B/2: ‘The best darn tootin’ idea I ever had’.
2009		Santa Maria Times (CA) 20 Jan. B6/4: [cartoon caption] ‘I’ll be darn-tootin’ if anybody is going to play Biloxi Blackjack Bingo on his laptop during a crucial budget meeting’.