Next time you are complaining about the stirring of your mates or the complaints of your Boss, you can say you are copping some flak and feel like you are being shot at! But be careful you don’t write you are copping some flack as that may be wildly misinterpreted!

Flack: (noun) press agent or publicist
The movie star relied on her flack to manage the press conference.
Flack: (verb) to act as a PR or press agent

Flak: (noun) anti-aircraft artillery or bursting of shells fired from anti-aircraft artillery;over the top and/or aggressive criticism; opposition, disagreement. {Flak is derived from the German name of aircraft defence gun –  Flieger Abwehr Kanone}
The politician was copping some flak over voting against his party on the carbon tax issue. 

Simply remember that a PR agent always adds a little extra – like the letter c in flack!