Green’s Dictionary of Slang

1. drunk.

1934		Weseen Dict. Amer. Sl. 279: [Drinking] Looped – Intoxicated.
1953		L. Durst Jives of Dr. Hepcat (1989) 8: There’ll be giggle water and food for your frame and if you get looped he’s not to blame.
1963		G. Lambert Inside Daisy Clover (1966) 72: I never saw anyone so looped in my life.
1970		E. Thompson Garden of Sand (1981) 302: Well, I gets a little looped up last week. [Ibid.] 315: Yankee Bill’s looped to the gills!
1978		S. Longstreet Straw Boss (1979) 274: Mike wondered if Terry was a bit looped—had a few.
1982		G.V. Higgins Patriot Game (1985) 129: We are going to sit here all afternoon until you get so looped you can’t see, if that proves necessary.
1993		G. Pelecanos Nick’s Trip 109: Toni looked a little looped but still conscious .
2000		G. Pelecanos Shame the Devil 44: Steve got a little looped on whiskey.
2016		T. Robinson Rough Trade [ebook] [M]y looped brain decided to turn the floor into a listing boat.
2021		J. Ellroy Widespread Panic 23: I got half-looped with the lads.

2. infatuated with something or someone, or crazy, demented.

1962

S. Longstreet Flesh Peddlers (1964) 120: Do I make sense, or am I looped?

3. (US drugs) intoxicated with a drug.

1985

T.R. Houser Central Sl. 34: looped out To be high on P.C.P.