Additional power which is added beyond what has already been added. Can be said multiple times for multiple effect. Closest synonym is "more oomph."
From the video game "Eternal Darkness: Sanity's Requiem," where all one has to do to juice up the power of a spell is recite the word Pargon repeatedly until the effect is larger.
This old computer is running too damn slow; I need to get some pargon for it.