Found it

(adapted from-www.sgfreakylinks.com/the-oily-man-)The Orang Minyak, translated into English as the Oily Man, are well known in our region for stealing, pilfering and raping women. Although they are more notoriously known for their raping and stealing antics, there are also reports of small boys who have been castrated by an Orang Minyak, which by doing so will add on to his power and knowledge. Yes, you’ve read that right. There have been such cases that have been reported before in Malaysia.