Green’s Dictionary of Slang

mota n.

also black mo, black moat, m.o., mo, moto
[Sp. sl. mota, dust; var. on moota n.]

(US drugs) marijuana.

[US]Goldin et al. DAUL 141/2: Mota. (Spanish-American underworld) Marijuana.
[US](con. 1940s) J. Resko Reprieve 236: The raw, fresh leaves of marijuana, gage, mota, gonga, griffo, tea, weed [...] are packed loosely in a small sized tobacco tin.
[US]R.R. Lingeman Drugs from A to Z (1970).
[US]B. Rodgers Queens’ Vernacular 210: marijuana [...] mota (Mex, ?fr Mex sl motor de chorro = marijuana).
[US]E. Folb Urban Black Argot 133: Black Mo/Moat a strong, dark for of marijuana.
[US]Bentley & Corbett Prison Sl. 53: Mota Marijuana.
GZA ‘Investigative Reports’ 🎵 Crack patients, dime smokers, vial carriers, mota tokers.
Mr Lil One ‘Karma’ 🎵 Mota for the smokers, coka for the nose.
[US]ONDCP Street Terms 14: M.O. — Marijuana. [Ibid.] 15: Mo — Marijuana. [...] Mota/moto (Spanish) — Marijuana.
[US]C. Goffard Snitch Jacket 40: ‘Quieres mota?’ ‘Marijuana?’.
Big KRIT ‘Hydroplaning’ 🎵 Sang the songs that chose to make people roll up the mota.
[US]J. Ellroy Widespread Panic 15: A Mex busboy sidled by [...] Manuel meandered back with the mota.

In phrases

black mote (n.) (also black mo, ...moat)(drugs)

1. a particularly potent variety of marijuana, with notably dark colouring.

[US] in E. Folb Urban Black Argot.
[US]S.N. Pradhan Drug Abuse.
[US]J.L. Dillard Lex. Black Eng. 96: Another interesting marijuana term studied by Folb is black moat ‘a particularly potent form of marijuana.’ Because of the phonological process of ‘weakened’ articulation of a final voiceless stop, the term tends to be something like black mo for the Negro population of Los Angeles.
[US]E. Folb Runnin’ Down Some Lines 170: Stronger mixtures like black [...] moat, black gungeon. [...] You got yo’ black mo’, it be dark, dark weed-buried an’ moldy an’ it turn black.
[UK]Daily Tel. (London) 30 Jan. n.p.: May I interest you in some Aunt Mary? Or perhaps a little baby bhang? No, I can see, you prefer El Diablito. Or bambalacha? Juju? Laughing weed? Doobie, chillum, ganja, blue de Hue, black mo.
[US]ONDCP Street Terms 3: Black mo/black moat — Highly potent marijuana.

2. marijuana mixed with honey.

[US]ONDCP Street Terms 3: Black mote — Marijuana mixed with honey.