Green’s Dictionary of Slang

Christmas tree n.1

1. in drug uses [the multi-coloured pills that are reminiscent of a Christmas tree’s lights].

(a) a stimulant (deximal spansules).

[US]M. Braly Shake Him Till He Rattles (1964) 21: Horse, pot, bennies, redbirds, yellow jackets, Christmas trees, perrys, dexies, or rainbows.
[US]R. Sabbag Snowblind (1978) 240: The most popular word is ups. Brain ticklers, browns, cartwheels, chalk, Christmas trees [...] are words of the sixties and are out of use now.
[US]R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].
[US]ONDCP Street Terms 6: Christmas tree — [...] amphetamine.

(b) a depressant (butabarbital, Tuinal).

[US] ‘Sl. of Watts’ in Current Sl. III:2 15: Christmas trees, n. A barbiturate in red and blue capsules.
[US]B. Jackson Thief’s Primer 110: Tuinal is what I like. Some people call them Christmas Trees [...] because they’re a kind of a green and a kind of a red – not true red and true green but the green and red they use at Christmastime.
[US]L. Kramer Faggots 301: You name it, somebody’s on it. [...] Christmas Tree. Mescalin.
[US]E. Folb Runnin’ Down Some Lines 167: Barbiturates were identified in terms of their colour [...] Tuinal (amobarbital and secobarbital), rainbow, christmas tree.
[US]ONDCP Street Terms 6: Christmas tree — [...] depressant.

(c) LSD.

[US]D.E. Miller Bk of Jargon 337: Christmas tree: A type of LSD.

(d) marijuana.

[US]ONDCP Street Terms 6: Christmas tree — Marijuana.

2. (US) a heavily over-made-up or over-dressed woman [she is ‘lit up like a Christmas tree’].

[[US] ‘Hot Rod Lexicon’ in Hepster’s Dict. 1: Christmas tree – A car that is loaded with gadgets].
[US]E. Folb Runnin’ Down Some Lines 42: Rainbow, color guard, christmas tree, Santa Claus [...] refer specifically to a person who wears too many colors.