Green’s Dictionary of Slang

1. a euph. for bloody adj.

1902		J. Masefield ‘Fever-Chills’ in Salt-Water Ballads 17: ’N’ they lies quiet in their blushin’ bunks ’n’ mops their gruel down.
1903		Bulletin (Sydney) 24 Dec. 17/2: He looked offended, and said he had thrown up a job at 9s. per day, mining, and ‘wasn’t taking any blushing quid a week.’.
1908		A.N. Lyons Arthur’s 236: ‘I beg your pardon!’ quoth Mr. Fothergill again. ‘Then it ain’t blushin’ well granted!’ answered this excellent drayman.
1923		J. Manchon Le Slang.
1933		M. Marshall Tramp-Royal on the Toby 14: I [...] got canned up, and some blushing dagoes half-inched my dough.

2. (US black) deceitful.

1995

L. Stavsky et al. A2Z 9/1: blushin’ – trying to hide something: Don’t trust that girl; I know she be blushin’.