As we know, Langau or "Blow Flies" is an insect that is quite loud and noisy. But in this case, we know people always keep make a judgement on ourselves right? Even if we get into a misunderstanding the other people. If there's a person that keep bothering you. The best way to make that person stop from talking is by saying repeatedly to them "Langau, langau,langau". This actually other soft words that could make that person stop bothering you. This kind of method will not make any offend feelings. So it is the good way to make you feel in the peace zone rather than keep hearing the words that you don't like from the other person.