Moist

Moist is a slangs used in most boarding schools. Which means something that is not sweet.

1. This boy too moist abeg
2. O boi wetin you talk moist
3. Moist boy

Mdidi

A vulgar or explicit way to say butt or ass.

Do not say this to anyone or you will be moered. 

You are mad, mdidi wakho. 

Onyanya

onyanya is someone who is stingy with anything

Peter okuna o onyanya

Makoya

A South African term that denotes that a person or thing that is authentic, real, or legitimate.

Zambuk is the real makoya.

Umjolo

A Xhosa word for dating

Umjolo uzokulimaza mntase

Oviedo

Greeting to a King or mighty one

Oviedo oo
Greetings to my king

Mjolo

Mjolo basically means dating. It's derived from ukujola which means to date. Therefore mjolo is the act of dating (ukujola).

Other people may spell it as mojolo

Mjolo will nyisa you. 

Bergie

A derogatory term, originally referred to homeless people who sheltered in the forests of Cape Town’s Table Mountain. It’s now a derogatory word for homeless people in general.

He left home now he is a bergie.

Bhantinti

ibhantinti is another term for a prisoner.

He got arrested last year, libhantinti ngoku.

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.