Green’s Dictionary of Slang

(US/W.I.) a general intensifier, e.g. not one Jesus shilling, not one damned adj./cursed shilling.

1929		E. Dahlberg Bottom Dogs 233: Everybody said outside after Sunday church was over, that it was a Jesus pity that a good, worked-to-deathed woman should be hitched up to a godless man like Jeremy Maxwell.
1968		A. Salkey Late Emancipation of Jerry Stover (1982) 152: A smoke? The weed never solve’ a Jesus t’ing, son. [Ibid.] 167: Not one Jesus Chris’ rass.
1976		P. Conroy Great Santini (1977) 346: ‘Un-Jesus-Christ-believable,’ Matthew exhaled.
1980		M. Thelwell Harder They Come 130: Every Jesas t’ing. An me maddah money too.
1988		R. Doyle Commitments 41: What’s fuckin’ dignified abou’ dressin’ up like a jaysis penguin?
1990		R. Doyle Snapper 144: Every jaysis one o’ them.