Fling

A fling is a basic movement technique in the Portal series. The player places one portal on the ground, then jumps into it from a high place. The momentum they gained from being pushed down by gravity then allows them to be propelled to another location after the direction of travel changes due to the position and orientation of the other portal. Objects can also be flung.

Good examples of flings are on (Chamber 18) and  (Cave Johnson).