Definition of "sai"

[…] the employer of the unfortunate maid that was forced to makan sai are indonesians.

1998 February 10, Thye Hoon Lin, “SM Lee was right - Johor is notorious for muggings!”, in soc.culture.malaysia (Usenet)

It is Chek Lap Kok ho lang. You should makan sai. Are you an Orang Laut trying to speak Chinese?

1998 July 9, SimiSar, “[sangkancil] New HK airport faces barrage of criticism (fwd)”, in soc.culture.malaysia (Usenet)

go and take your morning shower and wash your arse with water and soap after pang sai

2003 April 18, Bone Toad, “Christ won”, in soc.culture.malaysia (Usenet)