Chopper whoring is when people will only play chopper maps and will do nothing until they get a chopper. They will then proceed to (mostly) circle strafe.
Most of the time they are useless outside of vehicles, wrongly believe that they rule at BF and can only rack up high scores using overpowered vehicles that are hard to destroy (for the average player, there are some superb tracer/CG users and some AT4 artists,
but they are few and far between).
Too bad it is so difficult to tracer dart helicopters, it's probably the most irritating thing in this game for me. I only use the tracer now, I used to pistol, but it's so much more rewarding when you can help your team by tagging a helicopter or tank.