Rick my definition of the word would be to describe the pull/push effect that comes through the steering/front end as a result of slight changes in road surface.

Almost a momentary change in direction that needs steering input to rectify.

Not quite as sever as torque steer, nor as sever as when 1 wheel aquaplane's(is this a word ) but similar effect!

I suppose a good example would be when 1 wheel is on a whiteline!