tai san/toi san is a type of chinese, cantonese people call it toi san or tai san, when toi san people pronounce it, its hoi san. Hoisanese is all about the tone haha..such as saying the word "me"
toi san- ngoi
cantonese - ngo
the "ng" sorta sounds the same..but toisan "ng" sounds a TINY bit harser..haha i don't know how to explain it but..this might help explaining it?

http://asiafind.com/blog/4216/post_2...l?dcb=asiafind