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
Get 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 February 05, 2010
Get the i know you are but what am i? mug.
something i just asked myself and i just realised it was due 30 mins ago. ima kill myself bruh
why am i doing this instead of hw im literally still doing this shit
by Random schoolkid December 06, 2021
Get the why am i doing this instead of hw mug.
Most likely one of two reasons:
1. you're bored af
2. you have no life

But I guess there's always the third option...
3. finals
Now enjoy having wasted a good minute of your life typing in this ridiculous word that isn't a word and reading this stupid definition

Now I must use the word in order for this to be posted: Why am I searching random words on UrbanDictionary?

^Just ignore that okay?
by purpura7 October 06, 2016
Get the Why am I searching random words on UrbanDictionary? mug.

I know you are but what am I

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.
When looking for a quick laugh and have nothing to say, works best around nerd faces. Stupid comedy
Dude how many numbers am I holding up
by Mick Wagerson February 20, 2016
Get the how many numbers am I holding up mug.