Dreams about cleaning or picking up trash often symbolize a desire to tidy up or resolve issues in your life. Returning to your old high school suggests a revisit to past experiences or unresolved feelings from that time. The act of picking up trash could indicate that you are trying to clear away negative memories or emotions.

The presence of poop, especially in significant quantities, can represent feelings of shame, embarrassment, or aspects of your life that you feel are messy or out of control. The inability to clean up the huge splatter might signify that there are certain issues or situations in your life that feel overwhelming or beyond your control.

Overall, this dream could reflect a need to confront and clean up unresolved issues from your past while also acknowledging that some situations may be too difficult to manage on your own. It may be helpful to consider what aspects of your life need attention and how you can seek support to address them.