Definition of rootin’-tootin’ adjective from the Oxford Advanced Learner's Dictionary

 

rootin’-tootin’

 adjective
adjective
BrE BrE//ˌruːtɪn ˈtuːtɪn//
 
; NAmE NAmE//ˌruːtɪn ˈtuːtɪn//
 
[only before noun](North American English, informal)
 
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enthusiastic, cheerful and lively Word Origin late 19th cent.: reduplication of rooting in the sense ‘inquisitive’, an early dialect sense of the compound.
See the Oxford Advanced American Dictionary entry: rootin’-tootin’