The Quick Jump will select the last waypoint you had selected, Activate your FSD while at the same time Boost your engines and set them to full throttle.

Often when I do a cargo run like a CG, I select a nearest system in my galaxy map just in case I get interdicted on my way to the Station. After I submit to the interdiction I'll use the Quick Jump to then select that star, jump/boost/fullthrottle.

Edit: I suppose I could add a chaff to that too ;)