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Collision Boosting is a trick, done by using speed and the slope of objects/terrain to propel yourself over and past obstacles. This trick may often be called as an ABH Launch.
If you have a decent velocity, you can hit yourself to a sloped object or surface and get a Collision Boost which often leads to a big jump. The height and distance you get from it depends on the slope of the object.
In Half-Life 2, this trick is often referred as an ABH Launch. This is mostly because it's very easy to get a Collision Boost while ABHing, because you get lots of speed and every little slope can send you very high. Some times, ABH Launches can be rather tricky, random and may mostly depend on luck.