The phrase "cocking nora" is British slang for "Fucking Hell" as "cocking" is another way to say fucking and "Nora" is used to day hell like in the phrase "bloody nora".
Last night I had serious cocknative dissonance, I was talking to this really hot chick who seemed into me, but then she told me that she blew a trucker for a ride once, but I still wanted to hook up with her.