Javanese/Indonesian term (insult) to describe a person who's confused while other people around him are doing an activity, or can also be used to insult someone who has a stupid face or is dumbfounded with their mouth hanging open.
Mr. X: Hey, how you doing?
Mr. J: I'm great ahahahhah
Mr. X: So it's been 2 years, when will you pay off the debt?
Mr. J: *plonga-plongo
Mr. J: I'm great ahahahhah
Mr. X: So it's been 2 years, when will you pay off the debt?
Mr. J: *plonga-plongo
by RealXiJinping February 28, 2021