Weirdness

Yesterday was weird.

I was chatting with my friend. Then he said something ridiculous. I replied with:

Me: ... WTF?!?!
Him: Eh? What is WTF?
Me: Oh, my GOD.. You don't know what is WTF???
Him: Hehe. Dunno le.. Tell me lar.
Me: Ahem. WTF stands for 'what the f*ck'.
Him: What lai de?

Speechless, right? And he studies in the same class with me! The boys in my class should be very sure of what it means!
But after a few moments, he finally said:

Him: Aiyo.. I know lar. You think I stupid wan meh?
Me: ... Damn you.
Him: Buhahaha!!

Man, he's a weirdo.