See how the Urban Dictionary defined a Yoruba Demon

The term Yoruba demon has come to stay and is associated with guys from the western part of Nigeria(Yoruba) who break women's hearts or are serial cheats.
Well, the Urban dictionary has it's own definition with a name as an example. It reads

A Nigerian guy (Yoruba) who goes after a young lady's heart with no intention of loving her. They are typically met at parties, and would mostly wear white agbada (clothing).
They sometimes are seen in groups.
Oladimeji is a known yoruba demon.

The second definition reads

 A Yoruba demon is typically a young man of Yoruba (the Yoruba is a tribe predominantly found in South West Nigeria ) descent who has the uncanny gift to effortlessly make ladies fall head over heels in love with him. He is naturally a gifted smooth talker and Casanova and prides himself in been able to acquire a huge followership of female admirers and side chicks. He is also gifted at absolving himself of any responsibility in his relationships. Generally, he is a seductive cock-tail of sweet and bitter.
There is no going back after you date a Yoruba demon, you keep coming back for more.