ding, n.⁶ — Green’s Dictionary of Slang

ding n.⁶

[ety. unknown; the ding of pleasure it creates]

(US drugs) marijuana.

1954		Maurer & Vogel Narcotics and Narcotic Addiction.
1975		Hardy & Cull Drug Lang. and Lore.
2001		Daily Tel. (London) 30 Jan. n.p.: May I interest you in some Aunt Mary? Or perhaps a little baby bhang? [...] Doobie, chillum, ganja, blue de Hue, black mo, ding, bud, leaf, Marley, pachalolo? [...] How about some skunk, righteous bush or, let’s be perfectly clear, marijuana?