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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.
by CatStevensEvens March 08, 2017
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