The Splash Horoscope has the planets scattered pretty evenly around the wheel, as if they’ve been “splashed” there.
The effect is to scatter your energies, a little bit here, a little bit there. Jack-of-all-trades, master of none. Or perhaps a Renaissance person with wide ranging interests.
If you also have a lot of planets in the Mutable Signs (Gemini, Virgo, Sagittarius, and Pisces) the effect becomes more pronounced because these signs a scattering effect.
If your horoscope has many Fixed Sign placements however (Taurus, Leo, Scorpio, and Aquarius) you get better balance in your life since these signs are solid and serve as an anchor.
With the Cardinal Signs in the majority in your chart (Aries, Cancer, Libra, and Capricorn) you will still scatter, but you will do so with more force.
Teddy Roosevelt’s chart is a good example of a Splash Horoscope. Only Aries, Virgo, and Libra are empty.
Besides being president, he was also police commissioner, explorer, environmentalist, author, etc., etc.
A more recent example is Monica Lewinsky. Again the planets are evenly distributed around the wheel. Monica is still pretty young, but she’s already had a variety of positions.