Green’s Dictionary of Slang

living adj.

(US black/Aus.) an intensifier.

[Ire]J. O’Keeffe Farmer 17: Just as your Country Folks [swear] ‘Odibodikins’, ‘Gadzookens’, and ‘by the living Jingo’.
[UK]Quizzical Gaz. 27 Aug. 6/2: I’ve heard of it in ballad lingo, / And swear it by the living jingo.
[Ind]E.R. Sullivan Bungalow or Tent 259: I could not help fancying that the carcase of the boar had been animated by the soul of St Gengulphus, or ‘the living jingo’ as he is more familiarly termed.
[US]S.O. Jewett Deephaven 176: ‘I’m telling you the living truth,’ said Captain Smith.
[US]P.L. Dunbar Jest of Fate (1903) 58: Hit’s de livin’ trufe.
[Aus]V. Marshall World of Living Dead (1969) 124: I’ll cut the livin’ Christ out o’ yer flamin’ soul.
[US]W. Fisher Waiters 129: There began in his breast an emotional turmoil such as he had never before experienced. And he said to himself: ‘I’m a livin’ bitch’.
[Aus]K. Gilbert Cherry Pickers III ii: By the livin’ Jesus I’m gunna die as a man!
[US]D. Jenkins Rude Behavior 21: ‘I mean, shit, half the time, you can’t get kids to do what you tell ‘em to do. Not today. No livin’ way’ .

In phrases

beat the (living) Jesus out of (v.)

see under Jesus n.