Hawu

Hawu means either "how" or "why" and is often associated with confusion,the word was derived from South Africa and is gaining popularity

A exclamation of Latin cowboys who would condemn those to a branding that dared to cross their path, this phrase also means death to those who hear it.
If you were to hear this in the dead of night, be ready for a fight! They are coming. May God have mercy upon your encounter.