Wickipedia does not cover the use of it as a tool in therapy.

Much garbage goes into us when we are growing up, and many times in adulthood. We work at getting that garbage out when we start on our paths of healing.
Garbage In-Garbage Out...GIGO
Hearing tapes from the past; replace them with more positive tapes.
What goes in does not have to stay in.

Use of this term as a tool of therapy was adapted some years ago...it's helped people to visualize "taking out the garbage" we may carry in our minds.

IP