Green’s Dictionary of Slang

1. (US) very well.

1863

‘T.E.C.’ Battle-Fields of the South II 67: Tell her, Massa Smif, ef yer please, dat I’se gettin on blazing .

2. very, extremely.

1833		New Sporting Mag. Oct. 409/1: Mr Slater, the huckster, got blazing drunk.
1848		W.E. Burton Waggeries and Vagaries 11: I left the hull bilin’ on ’em blazin’ drunk.
1858		A. Mayhew Paved with Gold 98: He do like a bit of scarlet [...] You might a’most see to go to bed by Phil’s swearing, it’s so blazing powerful.
1859		Dickens (1970) Tale of Two Cities 42: That’s a Blazing strange answer.
1885		Bulletin (Sydney) 21 Mar. 17/2: Look here, old party, it’s all up! I’m done; / I’ve had a blazin’ roughish sort of life, / I’ve never brought you anything but sorrow, / But that’s enough, I’ve cut it like a knife, / I’ve joined the soldiers, and I start tomorrow.
1888		Barton Co. Democrat 12 Apr. 6/4: You come home blind, blazing, staggering drunk, and smash everything.
1890		Kipling ‘Black Jack’ in Soldiers Three (1907) 98: A draf’ from Kerry, an’ that was a blazin’ bad draf’.
1890		Kipling ‘The God from the Machine’ in Soldiers Three (1907) 15: You was blazin’ copped when you tried to wash in the Fort Ditch.
1911		J. Masefield Everlasting Mercy 54: So blazing mad, I stalked to bar / To show how noble drunkards are.