The meaning of Sinosijak

SINOSIJAK???

Some people must be curious about the meaning. Actually Sinosijak is one of iKON's song. The word Sinosijak has no meaning. Apparently, it is like a catchphrase.
There are three theories: 

• In Japanese 세노/seno means something like “1, 2, 3!” so something similar to “ready, set, go.” So sino could be a combination of seno and sijak.
•  Sijak/시작 means “start.”
• It could also be saturi. In Gyeongsangdo, kids say “sinosijak” before they start games.

Using sinosijak name is strange, but because there is some sense, i just use that name for my blog title =)