|1.||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!"
|2.||I Can't Believe You've Done This|
the new meme, originating from the infamous youtube video
pete: hey, say thanks to your mum for me
sam: aw fuck, i can't believe you've done this