Referred to Women's Vagina - in offensive term. Used widely for cursing by the Hokkien community in Southeast Asia especially in Medan and Batam in Indonesia, Penang and Johor in Malaysia, Singapore, and Taiwan.
To emphasize on rudeness, some people actually add "chau" (which means smelly) in the front as in "chau cibai".
"Cibai" can also be added in front of another noun to describe one's anger against the noun, such as "Cibai" Car, "Cibai" Face (or in Hokkien it is "Cibai Been"), "Cibai" Police, etc.
"Cibai!" My mobile phone was stolen again.
I will not work with that "Cibai" anymore