bulas Sense 1 noun English. One's testicles. Sense 2 English. A challenge to s.o. to fight (Lit. testes. The statement, “Your testicles” constitutes a challenge to fight.) Example sentence: Subanen. Kali' pektalu' si Kapun, “Bulas mu Intas, sa' kana' da gemputi'i pusung, angaya dini.” English. Kapun said, I challenge you, Intas, if you are not a coward, come here.