AGSP stands for Any Given Screen Positioning, though it's frequently called in an explicit way: VSP+LC.
Actually, AGSP is the straight combination between VSP and Linecrunch, allowing to scroll a bitmap in any direction. Anyway, these are mostly VIC-II tricks, and in general the acronyms are mentioned just as reference. The 264 series machines, in fact, boast some dedicated TED registers to perform bitmap scrolling in any direction.
After many non-scrolling levels, Majesty Of Sprites unleashes its power sending Kate into AGSP world.
agsp,any given screen positioning,vsp+lc