Definition of Sam Hill in English:

Sam Hill

noun

North american
informal
  • Used in exclamations as a euphemism for ‘hell’

    ‘what in Sam Hill is that?’
    • ‘He has an obligation to be concerned, and fans have a right to ask, "What in Sam Hill is going on here?"’

Origin

Mid 19th century: of unknown origin.

Pronunciation:

Sam Hill

/samˈhɪl/