wahaj
Wahaj is used to describe someone doing shady things i.e stealing someones assignment, lying, dating many people. Its not evil so much as mischievious, dubious character best described as shady behaviour.
Rather than say Jon Doe is so shady, they will say you are so wahaj. if someone copys someones work its known as a wahaj i.e did a wahaj.
He did a Wahaj on my assignment
OR
that drug dealer is so Wahaj