Who is 짠짜라?

I think 짠짜라 comes from this word, 짠하다? Watch the following music animation and see what you think:

짠짜라

Here is another version of 짠짜라. I think this one was filmed in Incheon in a park near the bus terminal.

Update: Here is the music video for 짠짜라.

Here is another video with questionable linguistic value: Bin 2 A.M.