Green’s Dictionary of Slang

(UK Und.) very.

1845		J. Lindridge Sixteen-String Jack 136: Oh, its glorious rich.
1880		Dly Cairo Bulletin (IL) 20 Oct. 4/4: They celebrated the meeting by a drink or two and both got glorious boozy.
1896		‘Army Slang’ in Regiment 8 Aug. 293/3: Staid old soldiers, many of whom had been ‘on the tack’ [...] ‘broke out’ and got ‘gloriously’ drunk.