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I was a kid in the 60's.. This phrase was not used by older sophisticated persons.. It was simply a juvenile response to juvenile name calling.. Some dumb kid would say: "You're Stupid" the simple and quick response would be "I know you are but what am I".. Sometimes (probably when first used) a good come back to one who was truly stupid, because it confounds them, confuses them.. "Uh uh uh, um, you're stupid?"
In actuallity, the phrase would go back and forth, several times.. "You're stupid", "I know you are but what am I" "You're dumb", "I know you are but what am I".. "What a jerk", "I know you are but what am I", "Jerk", "I know you are but what am I"...

Just a juvenile thing.. Used so often though (way back when) that til this day, I use the phrase in response to good compliments.. Most people my age, or close too, enjoy and laugh :)

Example: "You're cute" my response "I know you are but what am I" :)
by iBilly September 30, 2013
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Mar 6 Word of the Day
a spanish word meaning the flipflop
used by latin moms to beat their child's ass
Latin mom: DO U NOT FUCKING LISTEN CHILD
Latin child: OH SHIT NOT LA CHANCLA
by allygator February 07, 2015
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2
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
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3
The best come back to any insult in the history of the planet. Using this phrase will completely destroy and annihilate your component, so only use of absolutely necessary. (Say they think Sam and cat is a good TV show)
Fred:Our mom just died

Joe:I know you are but what am I
by •*MentallyMaggie*• March 08, 2020
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4
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
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5
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 04, 2010
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6
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
via giphy
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