Green’s Dictionary of Slang

naartjie n.

[S.Afr.Du. naartjie, a variety of tangerine or mandarin orange; ? f. Tamil narattai, citrus]

[1970s+] (S.Afr.) a fool, an idiot.

In compounds

Naartjie Republic (n.)

[1970s+] (S.Afr.) a banana republic.