Where does “ngocokin” come from?

ngocokin (Indonesian) comes from Indonesian -in, from Betawi -in, from Balinese -in.

Ancestry of “ngocokin”, step by step

Step	Language	Word	Meaning
1	Indonesian	-in	used to form benefactive aspect
2	Betawi	-in	used to transitivize a verb
3	Balinese	-in	—