Of all the stuff on that site, here are the ones im familiar with (and use)

Ag ('A*g')
A multi-purpose word, pronounced like the ach in German. "Ag, no man" (sign of irritation). Can precede any sentence for various effects, such as the more neutral, "Ag, I don't know." Used by some people as a stand-alone expletive.

Aggro
(Aggressive) Someone who brings bad karma into the water. From Aggro-Aussie, when Aussie surfers were the most aggressive.

Amped
(Full of energy) Usually induced by adrenaline, feeling wired or high on fear, either before paddling into a huge ocean, or the sheer stoke of being alive afterwards.

Baggies
We don’t call them board shorts or Bermudas or other naffy names. They are baggies. You wear them when the water is lekker warm.

Bakkie (Like “lucky”)
(Pickup truck in US, "Ute" in Australia) Many people own bakkies in South Africa, particularly in the rural areas. "That bokkie and her ballie parked off on the back of the bakkie." (That pretty girl and her father sat on the back of the pickup truck)

Bergie (bêr*gee)
(Alcoholic hobo who hangs out on the streets of Cape Town) The word Bergie comes from the Afrikaans “Berg” (Mountain) of Table Mountain, where they used to live. Some still do, in bushes or caves. Many stay in the city these days. You seem them huddled in corners at night, wrapped in a blanket, wrapped around a bottle of booze. They are a colourful people, with their own mores and subculture. Bergies are especially known for the bastardised Afrikaans obscenities they screech at each

Boer
Afrikaans – “farmer”. Used to refer to any (conservative) Afrikaans speaking person.

Boerewors (vorse)
Farmstyle sausage or "wors". (Literally, "Farmers Sausage"). It is a spicy sausage made from hundreds of secret recipes all over the Platteland and beyond. It is consumed in vast quantities on braais all over the country. Boerewors is even sold in places like Australia, Canada and New Zealand to homesick expats who have done the "chicken run", ie, emigrated for fear of compromised lifestyle.

Boykie
(Diminutive of “boy”, having used the Afrikaans method to indicate “small”) Macho types or rugger buggers call their mates this, particularly if their friend is a man’s man. When a man’s team members are impressed, you will hear “What a boykie!”

Braai (as in “High”)
(Afrikaans - Barbecue (US) or Barbie (Aus))Probably the biggest semantic gift given to the world by South Africa. You make a braai with wood in a metal drum or between bricks. You cook your boerewors, steak, lamb chops and sosaties on it. With your meal you eat mielie pap, salads, rolls and other stuff. You drink a Castle beer, or maybe a spook and diesel. Sometimes, if you have got some kreef (crayfish), you will have a crayfish braai.