Green’s Dictionary of Slang

1. of coffee, sugared; thus lace n., sugar.

c.1698		B.E. Dict. Canting Crew n.p.: Lac’d Coffee, Sugar’d.
1712		Spectator No. 488 n.p.: He is forced every morning to drink his dish of coffee by itself, without the addition of the Spectator, that used to be better than lace to it [F&H].
1725		New Canting Dict. [as cit. c.1698].

2. of a drink, mixed or combined with something; thus lace n., something added to a drink; lacing n., the addition of something to a drink [SE in 20C+].

1676		Wycherley Plain-Dealer III i: Prithee, Captain, let’s go drink a Dish of Lac’d Coffee, and talk of the Times.
1685		G. Meriton In Praise of York-shire Ale 3: Lac’d Coffee, Twist, Old Pharoh, and Old Hoc.
1712		Spectator No. 317 n.p.: Laced coffee is bad for the head [F&H].
1815		(con. 18C) W. Scott Guy Mannering (1999) 60: He had his pipe and his tea-cup, the latter being laced with a little spirits.
1828		W. Carr Dialect of Craven I 272: Laced-Tea. Tea or coffee mixed with spirits.
1852		Thackeray Henry Esmond 218: Polly loves a mug of ale, too, and laced with brandy, by Jove!
1861		(con. 1840s–50s) H. Mayhew London Labour and London Poor III 349/1: With a glass of rum in the last cup for the ‘lacing’ of it. [...] Tea the same as breakfast, and ‘laced’ ditto.
1874		‘Old Calabar’ Won in a Canter III 59: They required a mild stimulant in the shape of laced tea.
1886		Uncle Daniel’s Story of ‘Tom’ Anderson 157: ‘Laced? what is that?’ ‘Why, I put a little brandy in it.’.
1892		E.J. Milliken ’Arry Ballads 35: Talk is like tea; it wants lacing with something a little bit stronger.
1895		C. Crowe Aus. Sl. Dict. 43: Laced, strengthened with liquor.
1933		‘William Juniper’ True Drunkard’s Delight 249: Lace – Brandy of whisky added to tea or coffee, which is thence said to be laced.
1961		M. Braly Felony Tank (1962) 121: Doug sipped the laced coffee.
1974		(con. late 1940s) E. Thompson Tattoo (1977) 438: He hauled a pint of whiskey from beneath his car seat and laced their root beers.
1999		Indep. Rev. 9 Aug. 1: The strongest drink on offer is Sunny Delight mixed with vodka, rather than Kool Aid laced with acid.

3. of a drug, mixed or combined with something; thus lacing n.

1974		Eble Campus Sl. Mar. 4: laced – drug term meaning sprinkled with an additional, usually more potent, substance.
1989		(con. 1982–6) T. Williams Cocaine Kids (1990) 86: Masterrap, puffing on a cocaine-laced cigarette, complains to Charlie, ‘Hey, it’s canoeing’.
1997		G. Sikes 8 Ball Chicks (1998) 54: He lit a joint, sticking it under my nose to make sure I knew it was weed — ‘herbal,’ as he called it, not a ‘primo’ laced with cocaine.
2003		G. Tate Midnight Lightning 29: The lacing of bad acid into teetotaler Billy Cox’s punch bowl.
2004		A. Kleinzahler Cutty one Rock (2005) 167: He found some of those very early LSD-laced sugar cubes.

4. (US) drunk, intoxicated by a drug [one’s blood is laced with alcohol].

1988		Lewin & Lewin Thes. Sl.
1995		A. Heckerling Clueless [film script] It is one thing to spark up a dubie and get laced at parties, but it is quite another to be fried all day.
1999		Dr Dre ‘Murder Ink’ 🎵 Give em chase to the crib and yo he properly laced.

5. of music, mixed.

2001

Source Aug. 52: Busa Bus is thankful for having been laced by producers like Swizz Beatz.