Green’s Dictionary of Slang

(S.Afr.) a derog. term for an inhabitant of the Transvaal or the Orange Free State; Orange Free Staters collectively; also attrib.

1899		Cape Times 24 Nov. 7: Their Transvaal brethren [...] admit that the Blikoors [...] are the best body of men round Ladysmith [DSAE].
1913		C. Pettman Africanderisms 68: Blikoor One of the several nicknames given to the Transvaalers by the Dutch [...] and subsequently applied by the Transvaalers to their brethren of the Orange Free State.
1934		Star 1 May 13: For the past fifty years and more Free Staters have been known [...] as Blikore (tin ears) and Transvaalers as Vaalpense [DSAE].
1945		N. Devitt People and Places 144: The Transvaalers were called ‘Vaalpense’ (grey-bellies), the Free Staters ‘Blikore’ (tin ears) [DSAE].
1967		in Encyc. of S Afr.
1980		Sun. Times (S.Afr.) 12 Oct. 20: The squabble over who should succeed [...] as administrator of the blikoor province [DSAE].
1990		Weekend Post 23 June 20: The ‘Blikore’ are surely now also rans [DSAE].