Green’s Dictionary of Slang

x n.3

[the use of x as a code, i.e. because drugs are prohibited]
(drugs)

1. an injection.

[US]J.E. Schmidt Narcotics Lingo and Lore.
[US]Hardy & Cull Drug Lang. and Lore.

2. (US drugs) MDMA [pron. of ecstasy n.].

[US]Eble Campus Sl. Apr. 10: X – the drug Ecstacy.
[US]Ebonics Primer at www.dolemite.com 🌐 x Definition: an east coast slang term for the drug ecstasy. Example: Word Antoine! Lamar gave Shanique some X and the hoe started trippin’!
[US]T. Fontana ‘You Bet Your Life’ Oz ser. 4 ep. 8 [TV script] I’m celebrating [...] a little X.
[US]50 Cent ‘In da Club’ 🎵 Look mami I got the X if you into taking drugs.
[UK]G. Iles Turning Angel 336: I knew the significance of the pacifier. MDMA — or ‘X’ — makes the abuser grind their teeth.
[US]‘Dutch’ ? (Pronounced Que) [ebook] ‘X?’ ‘Ecstasy pills [...] X go for like fifteen, twenty a pill’.
www.verywellfamily.com/a-teen-slang-dictionary 10 Mar. 🌐 X - Ecstasy.
[US](con. 1994-5) D. Rucker Life’s Too Short 130: ‘I’m a drug dealer.’ ‘What do you deal?’ I ask. ‘Some weed, mostly X.’ ‘X,’ I say reverently. Ecstasy.

3. marijuana.

[US] ‘420 Dictionary’ at 420times.com 🌐.