What is "whoonga"

Whoonga (also known as nyaope or wunga) is a street drug that has allegedly come into widespread use in South Africa since 2010, mostly in the impoverished townships of Durban, although it is claimed to be appearing in other places in South Africa as well. The drug is said to contain antiretroviral drugs particularly Efavirenz of the type prescribed to treat HIV, but analysis of samples shows no such content, and police have remarked that dealers are known to add "all sorts of stuff" to a drug to bulk it out. In 2014, Vice magazine correspondent Hamilton Morris did a piece on this, titled Getting High on HIV Medication.