The idea that some other being can enter our body is ridiculous to me. I mean a virus or bacteria? Sure. But a whole other person who is you sized? I don't see how it is possible.
If we want to look into this -
It is called over-shadowing.
Jesus was actually in my belief over shadowed by another spirit.
(Their spirit is directed through your crown out your heart.)
It is when 'your' desires become those of another dimensional being (which may even be yourself in another dimension)
This makes decisions come from a greater cause, you give Trust to a higher purpose.
This isn't something you jump into straight away, I don't think this term is normally meaning this directly.
But yea, if it is, it isn't meaning a body swap, or even totally giving up your current identity, and it is not a possession because you still have total control of every decision.