Definition of Holy Joe in English:

Holy Joe

noun

informal
  • 1A clergyman.

    • ‘When I was in the Air Force, we called our chaplain a "Holy Joe."’
    clergyman, clergywoman, priest, churchman, churchwoman, man of the cloth, woman of the cloth, man of god, woman of god, cleric, minister, preacher, chaplain, father
    View synonyms
    1. 1.1A sanctimonious or pious person.
      • ‘Now I am not painting John as a Holy Joe, it is just that the lad is sensible.’
      • ‘Now do you really think that a Holy Mary would violate God’s Word?’
      • ‘"He was a bit of a holy Joe, to be honest, but everyone liked him," said a contemporary at Trinity. "One of his best pals was the college chaplain."’

Origin

Late 19th century: originally nautical slang.