Green’s Dictionary of Slang

(S.Afr.) stupid, simple, dim; thus doffie, a fool, a simpleton.

1979		Sun. Times (Jo’burg) 21 Oct. (Mag.) 1: Dof is being out of it [DSAE].
1986		P. Slabolepszy ‘Boo to the Moon’ in Mooi Street (1994) 116: All the time there’s this dof smile on his face.
1992		P. Slabolepszy ‘Return of Elvis’ Mooi Street (1994) 326: I knew straightaway the old farts were far too dof to crack any real rock ’n roll.
2005		A. Lovejoy Acid Alex 213: This is so fucking dof.
2009		Mail & Guardian (Johanneburg) 26 Feb. 🌐 Dof — stupid.
2012		IOL News (SA) 8 Feb. 🌐 The Department [...] is either deliberately hiring the country’s most astonishingly doff people, or people [...] are just playing doff.
2017		Capetown News 24 Online 5 Sept. 🌐 ‘Don’t be dof. Alcohol and roads don’t mix’.