I know you are, but what am I? 

It's quite simply the most retarded comeback someone makes when they've completely lost the argument. This statement signifies that the argument has gone to a completely immature level. Below is a hardcore argument starting with the immature statement :)

Person 1: I know you are, but what am I?

Person 2: Good question. What are you?

Person 1: Wow, you're so dumb, you don't even know what I am?

Person 2: You're so dumb, you can't even answer my question.

Person 1: I don't answer stupid questions. Sorry.

Person 2: Then you shouldn't have made your first one.

I know you are, but what am I? by Searingwolfe July 13, 2011

You-Know-Who 

A person, usually an acquaintance, who you find completely detestable. The mere mention of their name is enough to fill you with a feeling of dread, while an encounter with this person inevitably leaves a cloud of misery hanging over an otherwise pleasant day. This term is derived from a common reference to Lord Voldemort from J.K. Rowling's Harry Potter series.

"I bumped into You-Know-Who the other day...that basically ruined my week."

You-Know-Who by Bumpalicious February 6, 2010

how the hell should I know? 

An aggitated responce for when someone asks you a question you cannot possibly know the answer to. Usually said in a tone that is more or less telling the person to fuck off.

Guy #1: Where did I put my pen?
Guy #2: How the hell should I know?

how the hell should I know? by anonymous October 18, 2004

Lee Know 

a stage name for the sweetest, most talented dancer out there in the KPOP industry. so very humble about his superior vocal skills that he literally has every right to go ape shit but doesn't because he's patient and endearing like that. He is also his own goddamn person and not 1/2 of a fucking ship and literally got closer to BTS than any of you starkys ever will. He also loves his members a lot and likes to spoil his dongsaengs and his kids (Soongie, Doongie, and Doori) with a lot of love and attention so he deserves nothing more but the same treatment.

no one:

not a soul:

Lee Know: I love my cats so much

Lee Know by ctrIfelix October 11, 2019

I know a few 

A favorite quote of Ray Naker when he hears a third party bring up a certain experience, event, or situation that someone he knows has also experienced. This quote is usually dropped with malicious intent and is intended to point out the negative actions of some coons that Ray has encountered in his lifetime.

Armando: Y'all see the news tonight, there was a dude who just got arrested for raping a minor.
Ray Naker: Shiii, I know a few...
Armando: Put a name on it.
Ray Naker: Nah, we not gonna do em like that.

I know a few by TurnM3Up December 23, 2020

i know your kind

I know how you are, and what you do, and how you act.

Guy: I don't trust girls they all cheat.
Girl: I don't cheat on anyone!

Guy: "I KNOW YOUR KIND"
Girl: wow! How did you know I cheat like all the other girls? 😮

i know your kind by Cowboynatedog 👀 September 20, 2017

you know you want to

the only correct response to “fuck you”

Girl: you’re an asshole, fuck you!!
Boy: you know you want to ;)

you know you want to by Ladsladads April 24, 2021