Most members of the Poku Saeruo Degonjo who are warriors will eventually come up with a Boqatsou, Curse of Death or Death Curse. It is pronounced (bōkhăt-sōū). It is something that they work out over time; in fact it is not uncommon for the Death Curse to evolve. It is a phrase that they will say to defy death and possibly make their enemy hesitate. Most start with a fairly simple phrase and as they gain experience and face various dangers, they modify the phrase.
Note: It is not necessary to have a Boqatsou, but having one adds to the flavor of your character.