Green’s Dictionary of Slang

1. to inject oneself with narcotics.

[1881		Bulletin (Sydney) 4 June 9/3: [of chlorodyne] ‘Twas only, too, a little dose, / Just given for to ‘fix’ her].
1937		B. Dai Opium Addiction in Chicago.
1953		‘William Lee’ Junkie (1966) 121: She keeps outfits in glasses of alcohol, so the junkies can fix in the joint and walk out clean.
1963		M. Braly Shake Him Till He Rattles (1964) 55: He realized that when Kovin woke up he would have to fix.
1973		E. Bunker No Beast So Fierce 35: I fix once a week, the day after nalline. They can’t test you two days in a row.
1980		E. Folb Runnin’ Down Some Lines 172: To fix or geeze (to inject drugs, usually heroin).
1990		S. Morgan Homeboy 31: Just the jerk to spell me while I fix.
c.2003		D. Vrij ‘Tying Off’ on Inter-zone.org 🌐 Daltons usual practice was to fix, wherever he happened to be parked, a technique that had served him well.
2021		T. Swerdlow Straight Dope [ebook] — I don’t want to watch you fix.

2. to give someone else an injection.

1949		N. Algren Man with the Golden Arm 56: Fix me. Make it stop. Fix me.
1977		A. Hoffman Property Of (1978) 107: I know you got dope with you; fix me once and I’m gone for good.
1999		E. Bunker Mr Blue 85: ‘You fix me,’ I said to Flip.
2012		D. Whish-Wilson ‘In Savage Freedom’ in Crime Factory: Hard Labour [ebook] I sit him down and fix him, watch his pupils screw inward.

3. (US prison) in ext. use, to eat heavily.

1967

M. Braly On the Yard (2002) 82: We could lay up and eyeball them fine broads, then fix on free-world food.

4. in fig. use, to excite.

1997

E. Little Another Day in Paradise 145: This [i.e. a luxurious hotel] is as close to heaven as I’m ever gonna get but it don’t fix me no more.