loop, v.¹ — Green’s Dictionary of Slang

loop v.¹

[SE loop, i.e. one’s drunken meandering]

(US) to go on a drinking spree; thus on a loop.

1927		(con. 1917–18) J.M. Saunders Wings (1928) 161: There was no doubt that Johnny was on a loop.
1929		E. Wilson I Thought of Daisy 67: So there was nothing to do but go looping again—I was plastered for a week.