The movie censorship system in Hong Kong divides movies into 3 categories. Category three refers to adult materials. That's why we have the colloqual term 嶰媺曅 (category three movies). There is also another term 巐巈, which means category four movies. Of course this is a catogory that doesn't exist but it means that such pornography is even more obscene and hardcore than category three movies. 巐巈 is a very colloqual term. It refers to the hardcore pornographic video cds/dvds (not the cinema), typically sold in many shopping malls in Hong Kong that are full of pirated cds/dvds/softwares/games shops. I understand that you have chosen a answer already. I just hope that this term reaches you, just for your interest.

I am not familiar with the transcription system used by Kvasir. In the system I know, there are 7 tones in the Cantonese language. The transcripton for the term 巐巈, for your reference is: sei3jai4