Great for compost
I too have Jupiter in Scorpio, which is really the sign of compost not some stupid scorpion, no matter what the books tell you.
The keywords here are "too much is not enough"
As we all know, Jupiter is expansion, optimism, philosophy, the quest for meaning, yadda yadda. Think explosions; limitlessness. Remember too that planets always signify energy while signs tell us how the energy is expressed.
Thus, Jupiter will be expressed when in Scorpio through expansive intensity. Scorpio is deep, intense, fixed and controlled water. Images that come to mind for the combination are water expanding (jupiter) into steam in a boiler or water accumulated (jupiter) behind a dam. Very useful stuff unless it explodes in your face or drowns you as the dam bursts. You will feel (scorpio) this energy (jupiter) as intense optimism or when stilted a total lack of optimism. The middle ground may often be unavailable when channeled through Scorpio.
I'm about to hit my second Saturn return and in my life Jupiter's expansive energy and drive toward meaning has expressed itself as follows:
1. 3 rounds of higher education and I may not be finished yet. And my education was in such diverse areas as economics (BA), design and contract management. Jupiter is nothing if not inconsistent (which is why Saggitarius is mutable).
2. too much of everything that catches my attention, be it Tarot boards, collectibles, etc. I am particularly prone to delving (Scorpio) into systems of meaning like astrology, tarot, religion (all Jupiterian). I need to know a LOT. This tendency is exacerbated by mercury in Scorpio.
3. a willingness to accept and explore "untidy" subjects like compost, death and nasty posters on internet boards.
4. a tendency to shoot my mouth off (scorpio) when I perceive hypocracy (jupiter), especially when it comes to subjects like Tarot, Astrology, philosophy, religion, etc. (I loved the GOO thread). I really do have a problem with tact and politically correct requirements not to face nasty realities.
5. the need for and perserverance to engage in really intense and thorough (scorpio) study of any complicated topic (jupiter). Airy fairy thing R not us.
6. Jupiter is associated with humor and in my case I have an almost visceral (scorpio) need for it. I am usually at my most serious (scorpio) when I'm being flippant or funny (jupter).
7. A really wonderful attribute of Scorpio is the ability to grind off the chaff. And Jupiter provides the understanding of what is or isn't chaff in our lives. I've made a lot of mistakes, but this combo serves me well as I can, at least, understand where my ideas/philosophy/etc went wrong once I've gone through scorpios painful mill.
Divinatory meaning for others; it's a really bad idea to go toe to toe in a philosophy discussion with Jupiter in Scorpio people. They are likely to know more (juipter) in greater depth (scorpio) than you do and are willing to outlast (jupiter) you by several miles.
A final thought....watch out for Pluto transits in your chart. They WILL be meaningful.