When something is fabulous, but even more so, generally to do with the stage/performance.
A slightly more interesting way of saying fabulous.
The FABULISTICAL way of saying FABULOUS!
Usually accompanied by jazz hands, spirit fingers or some sort of showy hand movement.
Me: Wow, I can tell this performance is going to be fabulistical! *Jazz hands*
Me: Wow, I'm just SO fabulistic!