"I have Pluto in transit opposing or squaring Neptune in the birth chart. What is involved ?" What can it mean to have bad form Pluto aspects such as quadrature and opposition with our natal Neptune ? What a way to give an unfavorable passage of Pluto on the planet Neptune in our birth chart ? What does it mean to have the planet Pluto square or opposed natal Neptune ? The transit of Pluto quadrature and opposition to natal Neptune which carries positive connotations for us ? Which are meaning, significance, sense of the planet Pluto in transit in square or opposition at the birth Neptune ? Having this planet in bad aspect and then square (90 degrees) or that form an opposition (180 degrees) with the planet Neptune can bring important significance not only on a personal level. Let's say, however, that not take into consideration the position of Neptune in the 12 astrological houses and then Pluto transiting Neptune which is in I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII house. This is because Pluto is a generational planet, and therefore its influence rather than on the individual and therefore on its areas of life takes place and acts on an entire generation, an entire community.
Meaning : maybe you'll fall into a big depression and you will have all kinds of anxieties. You should try to avoid particular vices such as alcohol or drugs that would lead you into a situation where it would be very destructive and difficult, very difficult to get out.