I know you are what you said you are, so what am I?

The correct way to taunt on playgrounds. Often missaid as "I know you are, you said you are, but what am I?". Mostly by australians. Often shortened to "I know you are but what am I?"

Timmy: "you're a poop head"
Aaron: "I know you are what you said you are, so what am I?"
Timmy: *cries*