Green’s Dictionary of Slang

(S.Afr.) a term of abuse, ‘cad’, ‘bastard’; thus bliksemse adj., despicable.

c.1957		D. Swanson Highveld, Lowveld and Jungle 64: ‘The little bliksom,’ Klaussens said, staring down at the crumpled, inert body [DSAE].
1975		S. Roberts ‘Cleft Stick’ Outside Life’s Feast 85: There was a bliksemse lawaai coming from the bathroom [...] they were struggling with a razor and the woman’s wrists were bleeding but she was fighting like a blarry mad thing.
1982		P. Slabolepszy Sat. Night at the Palace (1985) 55: Yassas! You bliksem!
1984		P. Slabolepszy ‘Under the Oaks’ in Mooi Street (1994) 29: It’s nothing less than a full blown, honest-to-God bliksemse bloody police state.
1991		East Province Herald 10 Dec. 5: A bluxom can [...] be a person who makes himself objectionable for any number of reasons: slander, theft, forgetfulness, failure to pay a debt or failure to buy a round of drinks [DSAE].
2008		Mail & Guardian (Johannesburg) 29 Oct. 🌐 Sigh: Democracy is such a bliksem.
2012		Constitutionally Speaking 29 Oct. 🌐 ‘Bliksems’ — the cloest one could come in English here is ‘poor blighters’.