What is Kjo?

Noun - To say or do something to unknowingly make an utter fool of oneself.

The process of pulling a kjo is called "to be kjo'd"

E.g.

Kanu: Dude, I'm a maths champion!
Shaggy: Prove it!
Kanu: 12.5 x 2 = 35
Shaggy: What a kjo you are
PK: Haha, you've just been KJo'd!

Kjo - meme gif