Green’s Dictionary of Slang

chug-a-lug v.

also chuggalugg, chuglug
[chug-a-lug adv.]

1. to down a drink.

[US](con. 1942) J.H. Burns Gallery (1948) 184: I’m almost afraid to chugalug a drink or go out with a pretty little French girl.
[US]L. Uris Battle Cry (1964) 137: Burnside chuggalugged his third bottle down.
[US]M. Rumaker Exit 3 and Other Stories 39: Jim chug-a-lugged, picked up his knapsack and followed the sailor out of the bar.
[US]N. Thornburg Cutter and Bone (2001) 74: He [...] came out with Mo’s bottle of Lavoris, which he proceeded to chugalug, gargling it and spitting it into a dead potted cactus.
[US]J. Ellroy Brown’s Requiem 65: He’d chug-a-lug a half pint of bourbon, get up on a card table and suck his own dick.
[US]L. Bangs in Psychotic Reactions (1988) 303: If you’re feeling uptight and truly would prefer to sail into the mystic, just chuglug two quarts of coffee and throw on side one of the first Clash album.
[UK]K. Lette Mad Cows 237: Ignoring the wineglass Gillian offered, she seized the bottle, chug-a-lugging.
[US]J. Stahl Plainclothes Naked (2002) 168: Tony hoisted the Colt .45 forty-ouncer [...] and chugalugged half the bottle.

2. to get drunk.

[US](con. 1950s) H. Junker ‘The Fifties’ in Eisen Age of Rock 2 (1970) 99: Chug-a-lug. Getting blotto, stinko, shit-faced.