Boosting is a term used in GoldenEye 007 to describe when an enemy shoots you, causing you to "boost" in the opposite direction in which you were shot, or a nearby explosive has the same effect. Many GoldenEye WRs require a decent number of boosts (of both types) at certain points during the run. You can also boost yourself in some levels, using Grenades, Mines, Grenade Launchers, or Rocket Launchers. Self-boosting does not save as much time as the optimal boost by an enemy, but it is still a very important method for getting better times. For more in-depth strategic uses of boosts, see Use of Boosts in Goldeneye.
When an enemy hits you head-on, it's called a backboost. This is called a backboost because it impeeds your forward progress, usually costing .2-.4 of a second.
When an enemy shoots you sideways or at an angle, it is called a side boost. Sometimes these don't interupt the speed of a run and is neutral. Other times you can lose time or be pushed off course into a wall or other object resulting in major time loss.
Boosting still exists as a phenomenon but is not as significant a factor in Perfect Dark, as they don't knock you very hard. Boosting is almost never relied upon as part of the strategy for PD levels, the exceptions being the Skedar Jump and the entirety of War Agent.