A slander name for Indonesia, just like Indonesial and Indon. It's used by Malaysians who are called Malingsia, Malonsia, Malaysial,
etc. which are also a bunch of slander names.
Indon = Indonesian. Like nigga, if you're an Indonesian and use it, no problem. But if you're not and use it, this will offend them.
Sial =
Idiot. Commonly insult
word.
This
word sometimes comes with pig (babi) and dog (anjing) in the sentence, which are considered haram by both Malaysians and Indonesian.