Matric Dance
Also known as Matric Farewell - Is when grade 12 (last year of high school) learners have one final formal function, often followed by parties, underage drinking and bad decisions. Each school usually has its own dance and pupils usually come with a date and wear expensive suits and dresses.
Americans would call it prom
I don't know who I am going to take to the Matric Dance.
Nyoviolas
Nyoviolas is a playful variation or nickname referencing South African rapper Cassper Nyovest, often styled as "Don Nyoviolas".
Ola Nyoviolas, I am your biggest fan.
011
011 is the Johannesburg dialling code. It can also used to refer to Johannesburg.
I rep 011 till I die!