Blatantly useless retort which younger primary school students use.
Playground Bully: Ha ha! Ernie's Crap!
Ernie: I know you are, you said you are, so what am I?
Playground Bully: I just said that you were crap, though!
Ernie: I know you are, you said you are, so what am I?
by Ophite1 June 8, 2004
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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*
by TDYank June 10, 2020
Get the I know you are what you said you are, so what am I? mug.