Definition of rootin'-tootin' in English:

rootin'-tootin'

adjective

North American
informal
  • Brashly or boisterously enthusiastic.

    ‘their rootin'-tootin' summer adventures’
    • ‘This time, they have real rootin'-tootin' experts saying so on the record.’
    • ‘This rootin'-tootin' Texan seems like a regular Joe.’

Origin

Late 19th century: reduplication of rooting in the sense ‘inquisitive’, an early dialect sense of the compound.

Pronunciation

rootin'-tootin'

/ˌro͞otnˈto͞otn/