What is the meaning of Slipstream?

The low-pressure zone immediately following a rapidly moving object, caused by turbulence.

A generated advantage which makes forward movement easier.

A genre of fantastic or non-realistic fiction that crosses conventional genre boundaries.

To take advantage of the suction produced by a slipstream by travelling immediately behind the slipstream generator.

To incorporate additional software (such as patches) into an existing installer.

Source: wiktionary.org