List of colloquial South African place names

Alex - Alexandra, township to the north of Johannesburg
Arniston - Waenhuiskrans
Bloem - Bloemfontein
Borders - The Eastern Cape area, near East London, due to its location between the Bantustans of Transkei and Ciskei
Durbs, Thekwini - Durban
Eastern Province - Eastern Cape¿
Free State - originally short for Orange Free State, now official name for Free State Province
Graafies - Graaff Reinet
The G-Spot - Grahamstown
Jo'burg, Jozi, Joeys, eGoli - Johannesburg
Kaap, Cape - Cape Town. As in "Ek gaan Kaap toe" (I am going to the Cape). From the Afrikaans name for Cape Town, Kaapstad
Keurbooms - Keurboomstrand
King - King William's Town
Maritzburg - Pietermaritzburg
Mas Vegas - Masvingo
Mzansi - South Africa (uMzantsi is Xhosa for 'south')
Mother City - Cape Town
Moz - Mozambique
Nam - Namibia
Toti or Amanzimtexas - Amanzimtoti, (resort town outside Durban)
PE, Baai - Port Elizabeth. "Ek gaan Baai toe" is Afrikaans for "I'm going to Port Elizabeth". From "Algoabaai" (Algoa Bay).
Plett - Plettenberg Bay
Potch - Potchefstroom
PTA - Pretoria
RSA - Republic of South Africa
Slummies - East London
TBVC states - Collective term for the homelands Transkei, Bophuthatswana, Venda and Ciskei under apartheid (now defunct)
Vaal - The Transvaal
Western Province - Western Cape
Zim - Zimbabwe (Zimbabweans call South Africa 'South')