Green’s Dictionary of Slang

(S.Afr.) a general term of approval meaning wonderful, first-rate, excellent; as adv. kiff-kiff enthusiastically.

1905		Aus. Town and Country Jrnl 3 May 16/4: The most curious slang in the world is that of South Africa. [...] Nothing is ever good, but anything, from a concert to a pair of boots, will be decent, or ‘all kiff’.
1952		S. Selvon ‘Calypsonian’ Bim V 17 in Selvon (1989) 149: He laugh kiff-kiff and give Rahamut a pat on the back.
1955		S. Selvon ‘Come Back to Grenada’ BBC Carib. Voices 27 Dec. in Selvon (1989) 167: George warm under the blankets [...] would laugh kiff-kiff as if is a joke in truth.
1978		The 1820 51:12 19: And while on the subject of poison, it [...] appears in expressions like she’s a poison bokkie, or in its translated and further transliterated forms gif and kif — she’s a kif chick. That means.. she’s an attractive girl [DSAE].
1983		Frontline (S.Afr.) Oct. 61: The skate has his own dialect [...] ‘I got a graft, a cabbie, I got stukkies, booze, and I got zol. I tune you, mate, if I can get one mamba chow a day, I scheme life is kif.’.
1993		Rustenburg Girls’ High School Mag. n.p.: She called him over and they had this kiff rap and they both put in some major spadework [DSAE].
1997–2000		College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Kief (adj.) Rather bad or pretty cool.
2001		OnLine Dict. of Playground Sl. 🌐 kif n. nice ‘Those pants are kif!!’.
2004		Mail & Guardian (Johannesburg) 9 Dec. 🌐 popular south oke words are ‘kiff’ or ‘nice’ (pronounced ‘noas’) meaning great.
2010		Mail & Guardian (Johannesburg) 8 Jan. 🌐 That was really kif bru.
2010		Mail & Guardian (Johannesburg) 23 Mar. 🌐 You will also get some kiff new stuff like learn how to use a gun.
2010		IOL News (western Cape) 22 Feb. 🌐 Zef isn’t safe; it isn’t lank tit, either, and neither is it schweet, safe or kief, my broer.