How to call it when a vehicle that just passed you gets back in lane too early, forcing you to brake, or even causing an accident?
See this Diagram.
This can also happen when a vehicle overtakes and then decide to turn very soon afterwards, cutting your way.
In French it is called queue de poisson.
It is DIFFERENT from "fishtail". Fishtail is when a vehicle loses control due to an obstacle, "queue de poisson" usually does not involve losing control, just braking in a straight line, in most cases. Fishtail can be had alone, "queue de poisson" can't happen with less than 2 vehicles.