Green’s Dictionary of Slang

Durban poison n.

also Durban, D.P.
[similarity in pron. between Afk. gif, poison and kif n./kif adj.]

(orig. S.Afr.) an exceptionally well-regarded variety of marijuana, grown near Durban, Natal.

personal recollection.
[SA]J. Matthews The Park and Other Stories (1983) 20: Firs’ class stuff. Jus’ like Durban poison.
[Aus]R.G. Barrett Real Thing 143: me and a mate cross-bred these plants with seeds from ‘Durban Poison’ and ‘Thai Buddha’.
[UK]N. Barlay Curvy Lovebox 33: What happen to [...] de lunatic Durban or dat sticky fokkin orange skunk.
[UK]Observer Mag. 13 June 51: Durban Poison. Despite the fearsome name, this is a relatively mild, pure sativa from South Africa.