It can be added to someone's name to make it sound funny or offensive.
A: i 1 month no pang sai liao.
B: 1 month r? Better go see quick. Later the sai go into your brain then you die.
A: wei...don say like that i worry leh.
Pang Sai + Name
Pang Sai + John = Pang Sai John
Pang Sai + Andy = Pang Sai Andy
Pang Sai + Jie = Pang Sai Jie
2) A crude chinese man's curse when something unfortunate happens to him.
1) Chinese Man: "That Indian dude smells just like pangsai!"
2) Man: "Pangsai! That was the strangest vaginal flatulence I've ever had!"