Green’s Dictionary of Slang

(S.Afr.) sulky, pouting.

[1979		Sun. Times (Jo’burg) 9 Sept. (Mag. Sect.) 5: Do you remember how cold the wind was? [...] We called it the dikbekwind, the angry wind [DSAE]].
1986		Sun. Times (Jo’burg) 2 Jan. (Mag. Sect.) Going home Tannie [...] is dikbek [...] Kev won’t let her come with us for a dop and insists on taking her straight home [DSAE].
1990		A. Dangor Z Town Trilogy 162: Dikbek, morose. Call it what you will. You are unpleasant to have around.