Moer

To beat someone to a pulp.

Can also be a swear word in Afrikaans

I will moer you.

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. 

Jola

This depends on the context. Jola can be someone's clan name if you are Xhosa. 

It can also mean dating, see ukujola or mjolo.

NdinguJola, Mphankomo...

Ukujola

Is to date someone or being in a relationship.

When did you start ukujola now?

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. 

Haibo

An expression of surprise or shock (basically means wow), mostly used by Xhosa speaking people. It can also be spelt as Hayibo.

Haibo, is this really happening?

Mr 082

A guy who trended for what was apparently a staged video. He was asked for his number by a woman in a car and he kept saying "082". Twitter gave him the name Mr 082. 

Did you see the Mr 082 video?

Nka screama gore

A popular Tswana/Sotho phrase on social media that means "I would scream". It's used as an expression when something shocking happens.

Imagine if ISIS would come to South Africa. Yhuu nka screama gore.

Ayobaness

Another term for ayoba, a catch phrase that was popular in the Blackberry and YoTv days.

That's so ayoba.
Ayobaness.

Meneer Magongwa

A situation where you don't have money and you have no means of getting it.

I'm so Meneer Magongwa these days.