Basically you can't come back from it unless you use an Uno reverse card. An op roast for kids 7-10
Gay1:your mum gay lol
Gay2:no u

Gay1:uno reverse card

Gay2:I know you are but what am I

Gay1:fuck
by Oh crackers April 26, 2019
mugGet the I know you are but what am Imug.
Very sketch sentence used bu juvenile delinquents to throw off reporters.
+Here's an actual customer out here, uh what's the best kind of firework to buy?

- Wouldn't you like to know, weather boy?

+Where are your parents? Kid's sketchy, back to you guys.
by Eldeirun July 13, 2023
mugGet the wouldn't you like to know, weather boy?mug.
If you say the phrase 'You don't know me but I killed you're brother,' your actually telling that person you kicked their cat and you're very sorry.
by YoUrMoThEr6969 December 8, 2007
mugGet the you don't know me but i killed your brothermug.
A complete fail of a comeback... basicaly... you would use it when you get verbally bitch slapped your face is all red... and you cannot come up with a comeback.
Faggot: You smell bad

Me: Wow... because you said that dis you went from nobody loving you... to having a small squirl start to love you... oh wait... that squirl just got ran over by a car... your back to nobody loving you...

Faggot: I know you are but what am I?
by balla911 April 16, 2009
mugGet the I know you are but what am I?mug.
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 March 19, 2010
mugGet the i know you are but what am i?mug.
not knowing someone at all - to be more precise, not knowing someone even at the very infinitesimal atomic level.
"yo brah whuh chu jarking?"

Shit man, i dont know you from atom
by Jar-King March 30, 2010
mugGet the i dont know you from atommug.

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