Green’s Dictionary of Slang

inspired adj.

drunk.

[1927		S. Graham N.Y. Nights 71: His was decidedly a seasoned head. With every glass of ‘inspiration’ he took two chasers of beer].
1933		‘William Juniper’ True Drunkard’s Delight 225: Our tippler may further be [...] inspired.
1937–84		Partridge DSUE (1984) 599: [...] C.19–20.