Mgqakhwe
In Xhosa, umgqakhwe is a derogatory term used to refer to someone born out of wedlock.
"Makungangeni mgqakhwe ebandleni likaYehova; nesizukulwana sawo seshumi masingangeni ebandleni likaYehova." - deuteronomy 23
"No one born of a forbidden marriage nor any of his descendants may enter the assembly of the LORD, even down to the tenth generation."
Welele
Its more of a word of disbelief or a lie example when someone says something like"oh i'm sure she's a humble girl and doesn't do thing like other people her age" but you know that's not true it like you know something but instead you use the phase "welele" to like tell the other person that it's not true or it's a lie
"Did you hear that she broke up with her boyfriend again" then someone says "welele" in disbelief
Sepitori
Also known as S'Pitori, is the language spoken by native people of Pretoria (Pitori). It is a combination of Pedi and Tswana, with a bit of Tsotsi taal.
I speak a bit of Tswana plus sepitori.