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Crouch Boosting is a glitch that multiplies your speed whilst out of bounds.
Explanation and How-to
While you're out of bounds in the preupdate version of the OrangeBox Engine or Old Source Engine, you can move around freely. If you crouch and uncrouch repeatedly while moving in the air your speed will increase. Optimal duck spam will multiply your speed by a factor of about 1.5. Note however that the engine doesn't consider your speed to be changed, so you can actually travel faster than the engine's speed limit of 3500 ups.
It is recommended to use +y_spt_duckspam in Source Pause Tool for scripted runs as it's tick perfect unlike Autohotkey.