i can't believe you've done this 

Something uttered by British people after they've been suckered punched. Usually preceded by the exclamation "Aw fuck", and accompanied by a look of complete bewilderment.

British guy: Blah Blah Blah Blah
British guy's friend: *punches British guy in the face*
British guy: "Aw FUCK, I can't believe you've done this!"

i can't believe you've done this by Susake December 1, 2007

I Can't Believe You've Done This 

the new meme, originating from the infamous youtube video

http://youtube.com/watch?v=8lBO23Dh23I

pete: hey, say thanks to your mum for me
sam: aw fuck, i can't believe you've done this

I Can't Believe You've Done This by crincled January 8, 2009

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

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

Ah Fuck I can't believe you've done this 

Expression of anger after someone has annoyed you

"Ah fuck I can't believe you've done this Barry why did you break my mum's lamp."

Ah Fuck I can't believe you've done this by Anti-hypofritz February 26, 2017

sans sheriff 

Lawless use of fonts or typography, with no regard to aesthetics or legibility

I'm putting this CV straight in the bin. Written totally sans sheriff.

sans sheriff by Jamarley July 3, 2019

Breadhead 

Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".

A breadhead is like a crackhead, but for money instead of crack.

Breadhead by 🅱️ U S 3 4 8 March 30, 2022