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The Zain Test, locally originated in Durban, South Africa in the early 2000's by a group of school kids. Named after one of the guys in the group. It is the test of fidelity and loyalty of a guy's female partner.
Traditionally, a guy would ask another guy (The Zain of his friends), ie: the most charming or persuasive and successful in seducing women, to test his Girlfriend to see how faithful she is to said guy.
It has evolved since then and can also be a test to measure the promiscuity of a woman.
When you trust Zaia the Gayah with your phone but he sucks off your friends nuts so he lets your friend delete all those embarrassingSnapchat videos you have of him.