Can anyone explain to me in their own words what nonjusticiable means?

for no legitimate/legal/social/religious reason....... basically..... done because... "I felt like it... and it felt good.. so to hell with what anyone thinks"

It means "something that a court has no authority to rule on," like what color your hair should be, or what to name your dog.

Look it up in a dictionary. It is a real word, and has been for a very long time.

There is no such word, so perhaps you meant "non-justifiable", or "unjustifiable". It means "Unable to be justified".