Countersteering in RC drifting refers to over driving the rear wheels so the car is fighting to stay straight no matter is the front wheels are turned or not.

It tends to look more realistic as it's comparable to having more power at the rear wheels than the front.


This is a good example
http://www.youtube.com/watch?v=jbw_y9g-OPc

These are 2 HB TC-D's running the same except the car in front has been setup to countersteer.


You can see that it carries more angle, is sideways more often and is slightly slower than the non countersteer car.
It's also more difficult to control and not really for beginners.



Cheers
Mark