Mzansi
The colloquial term used by us South Africans to refer to our country. It is the Zulu word for the "South" part in South Africa. The full word is Mzansi Africa.
People of Mzansi will support their own.
Kganthe why?
It's a combination of two words, Sepedi and English, by Mogau Samson Leagathoko Malepe asking someone to rephrase their statement, or tell, "I don't vibe with you" or "I don't follow".
"Bra, I've been looking for you all-over, where did you dissappear to?"
MSL Malepe: "Kganthe why?(with an annoyed lookalike face)"
Amandala
The word is used as an intentional misspelling and pronunciation of the word ‘amandla’ which means strength.
The word was popularised on social media after Naomi Campbell said ‘amandala’ instead of the correct ‘amandla’ at the Global Citizen Festival in 2018.
You'll be strong. Hayi wethu Amandala to you.
Africtionary
Africtionary is an online dictionary dedicated to African slang. It aims to document and preserve the diverse and evolving language of the African continent.
I found the definition on Africtionary.