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.