Sheng

Sheng is a 'street' language that is a mixture of Swahili and English commonly used amongst teenagers in order to communicate without older people finding out. The name comes from the S and H in Swahili and the start of English. The 'H' in the word Swahili is used because 'Seng' would have sounded weird. This slang language is commonly used between hip-hop artists and secondary school students. 
Some of the words in Sheng that have changed include:
mode = teacher
earthwire = tie
dush = bird
njumu = shoes
and many more.

This language hasn't been noticed throughout the whole of Africa becausen of how it is only spoken within the younger generation, therefore the older generation have little or no knowledge of this language. If the langauge of Sheng were to kick off and become a language used all over the country, each section and each generation would have to have common knowledge of it.