What is "slingshotting"

Usage examples of "slingshotting".

It propelled itself across interstellar distances by discharging energy plasma and, at a high but space-normal velocity, slingshotting around a pulsar or neutron star within the Hunger Zone to achieve warp speed.

Overlay that with the mathematical descriptions of warp drive and slingshotting through high intensity gravity fields, and theoreticians in even the most ivory of towers could only speculate on how it all would apply to the so-called “real world.

In fact, even when the hole's between the two systems it might be a help slingshotting ships back and forth.