I cant believe you have done this 

Total disbelief, British style

ah fuck, I cant believe you have done this

I cant believe you have done this by d4mn3d June 2, 2008

i cant believe its not butter 

when you cum on a girls back and or bread then spread with a butter knife. She then eats the bread on her back you lie down on her back and you get stuck to her.

i did a i cant believe its not butter to my girl last nite.

i cant believe its not butter by tkifr March 2, 2008

I cant believe you done this 

A meme from the vine.

After betraying his tribe he was told by the other tribe's leader "I cant believe you done this"

I cant believe you done this by djbeard December 15, 2017

i can't believe you searched this! don't you have anything better to do?? anyway, this is something people type when they are super bored (and/or super dumb) and want to see what happens when they type exactly what is already in the search bar. 

This is the definition of Type any word... this indicates that if you somehow found this definition for a definition that, you are indeed insane.

I can't believe you searched this! Don't you have anything better to do?? Anyway, this is something people type when they are super bored (And/or super dumb) and want to see what happens when they type exactly what is already in the search bar. is the def

i can't believe you searched this! don't you have anything better to do?? anyway, this is something people type when they are super bored (and/or super dumb) and want to see what happens when they type exactly what is already in the search bar. by MERC907 May 3, 2018

ah fuck, I can't believe you've done this. 

A statement of frustration said when one is about to say something and is interrupted abruptly; usually with a punch to the face.

Note: It has to be said in a non-enthusiastic, brittish, calm and polite manner, if you will.

Example:

Some guy: "Hello everyone, i'm here today to talk about... *PUNCHED IN THE FACE*

Same guy: "Ah fuck, I can't believe you've done this."

ah fuck, I can't believe you've done this. by JoãoPaulo November 13, 2007

I can't believe you looked that up 

My response to anyone who looked that up.

Seriously, I can't believe you looked that up...

I can't believe you looked that up by seriouslywhydyoulookthisup April 2, 2010

Ah fuck. I can't believe you've done this. 

Best response to being punched. Ever.

Guy #1: *Punches Guy #2 in the face*
Guy #2: "Ah fuck. I can't believe you've done this."

Ah fuck. I can't believe you've done this. by liMPiNMEdiC January 6, 2008