Green’s Dictionary of Slang

(US tramp) to drink, usu. to excess, thus barrelled, drunk.

1931		Irwin Amer. Tramp and Und. Sl.
1953		‘John Eagle’ Hoodlums (2021) 40: Gump was barreled. He didn’t look it while he was sitting down; but now when he was standing, his figure wavered like the rest.
1962		Ragen & Finston World’s Toughest Prison 790: barrel – To drink, especially to drink to excess.