A phrase used to signify that an argument has degraded to an immature level. Used as a response to someone that's turned a friendly discussion in to a personal argument.
Person 1: I hate iphones!
Person 2: I think they rawk. iPhones for everyone!
Person 1: You're a poo brain.
Person 2: I know you are but what am I?
by an0nym0usc0ward February 5, 2010
Get the i know you are but what am i? mug.
A great comeback or a phrase that will wreak havoc. This phrase and be used to simply annoy someone or to say for the heck of it.Also it can be used in a conversation.
1)Ruben:Your a butt cheek

Tom:I know you are but what am I?

2)BOB:I'm going to be Albert Einstein

Rick:I know you are but what am I?
BOB:Beats me it's up to you
Get the I know you are but what am I mug.
The gen z way of saying haha bitch I won the argument

It is literally the worst comeback of all mankind
You are dumb

I know you are but what am I
by 42069ultimateholdersex April 2, 2021
Get the I know you are but what am I mug.
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
Get the I know you are, you said you are, so what am I? mug.
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.