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Who are you, and what have you done with

Used to express astonishment when somebody says or does something completely out of character. The only possible explanation is that they've been replaced by an alien shape-shifter who looks exactly like them, but acts differently.

The phrase is a parody of the cliché found in old movies, when somebody returns home to find their lover gone and a stranger in their place.
Shanee: "I'm going to stay in tonight and study."
Ruthie: "Who are you, and what have you done with Shanee?"
by Yogi Bhajan February 26, 2011
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I'm 12 years old and what is this?

Internet meme that came about after some kid said it on a comment when Youtube.com was raided with porn. Usually said after something that adults talk about/kids wouldn't get. Not to be said in real life, like most other memes.
Anon A: I was wondering, do you guys prefer anal sex or vaginal sex?

Anon B: I'm 12 years old and what is this?

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Anon A: Do you think its worth it to have sex without a condom?

Anon B: I'm 12, what is this??
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Anon A: My girlfriend just blew me, shit was SO cash.

Anon B: inb4 I'm 12 and what is this

Anon C: I'm only twelve, what is this?!
by JD13 July 25, 2009
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Hilarious quote by Arnold Schwarzenegger in Kindergarten Cop. Used excessively in Arnold prank calls which can be quite hilarious. The term who is your daddy which derrives from this usually is an expression of personal superiority to someone else or to emphasize a victory.
Johnny just beat Tom in a videogame.

Johnny: "Who is your Daddy?"

Jim is screwing Sharon and making her scream quite loudly in orgasmic ecstacy

Jim: "Who's your daddy bitch? Who is your daddy??"

Sharon: "You!"
by Perverted Senin August 25, 2003
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i am 12 years old and what is this

A reaction of a 12 year old on something inappropriate.
'porn on youtube'
''i am 12 years old and what is this''
by david.david.son June 26, 2009
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I'm 12 and what is this?

Sometimes used ironically on image boards like 4chan when someone posts off topic or offensive material on a board where such content is inappropriate. This is usually posted in combination with sage to avoid bumping the thread.
anonA: Furry time!!!1 (explicit image of fluffy creatures)
anonB (sage): Please go away.
anonC (sage): I'm 12 and what is this?
by greiz June 7, 2011
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Best ... Arnie ... Line ... EVER!
"WHO IS YOUR DADDY AND WHAT DOES HE DO?" - Arnold Schwarzenneger
by Chris Ridsdill November 26, 2003
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I'm 13 years old and what is this?

Another less funnier variation of the meme I'm 12 years old and what is this?

Said in forums that restricts the registration of people below 13. If you put the original version of the meme, which is: I'm 12 years old and what is this? Mods might think that you're ACTUALLY 12 years old and ban you because they're dumbass pricks, or just have a reason to ban you for the lulz.
Person 1: "I'm 12 years old and what is this?"

Dumbass Mod: "You're 12 years old? This forum is for ages 13 and up! *Bans Person 1*"

Another day:

Person 2: "I'm 12 years old and what is this?"

Dumbass Mod: O rly? I know that's a meme, but you piss me off and I have a reason to ban you. *Bans for the lulz*"

Yet another day:

Person 3: "I'm 13 years old and what is this?"

Dumbass mod: I thought the meme was "I'm 12 years old and what is this." What the fuck is going on?"
by UrbanWolf2215 July 24, 2010
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