The origin of that concept?
68% more likely to be originated from Kampung Gajah.
How to learn it?
Think or sink. Or here’s the shortcut: join Kampung Gajah.
What is it?
Serious joke is joke that you value as your own life, seriously. It means that you get that joke out of your mouth with all the possible consequences that you have thought over beforehand and bear eagerly, not a joke that you throw away like shit and then you walk away when that shit get bigger and backfired.
Why?
To distinguish whether you are a person or merely a dick (dickess if you’re a woman).
So?
This is just another joke, seriously.