What is Ah Fuck, I Can't Believe You've Done This.?
1.
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."
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1.
The elapsed time of a conversation before the subject turns to Adolf Hitler, in much the same way a high-performance car is evaluated at..