When you point out something to make someone else look quickly, but what you said was there really isn't. It is only a broken neck if the person turns their head to look at it. If you did break their neck, then you place your hand on the back of their neck and "run it". If you really look, but said you didn't and don't accept the fact that you got your neck broken, this is called being a Cowan or Matt Cowan.
James: Oh my god, Stru, look! It's snowing outside.
Stru: *quickly looks but it is actually a bright sunny day*
James: Broke ya neck! *runs Stru's neck*
Stru: ...Fuck!
or
Cacioppo: Yo Cow! Is that Mark over at the basketball court?
Cowan: *looks towards the court and nobody is there*
Cacioppo: Damn! Broke ya neck!
Cowan: What the fuck are you talking about I didn't look at all!
Cacioppo: Ay..don't be a Cowan.
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. Penguin Books,1992. p. 38)