Green’s Dictionary of Slang

katootin’! excl.

[ker- pfx + tooting adj. (1)]

(US) a general intensifier, as in durn katootin’ right.

[US]Herald News (Seattle) 19 Jun. 🌐 Last year when Mabel Oliver blew out the candles on her 99th birthday cake, her wish was to live to be 100. She reached that milestone Friday—on Flag Day. Is she going for the second hundred? ‘You’re doggone katootin’ I am,’ Mabel shouted.