Dreams often reflect our subconscious thoughts and feelings, and the elements in your dream can provide insights into your current life situation.

1. Banquet with Food: This could symbolize abundance and the pleasures in life. It might represent a desire for enjoyment or a need to celebrate achievements.
2. Back in High School: Returning to high school in a dream can indicate feelings of nostalgia or unresolved issues from that time in your life. It may suggest you're reflecting on your past experiences and how they have shaped who you are today.
3. Telling an Old Classmate You Reformed: This part of your dream may indicate personal growth or a desire to demonstrate change to those from your past. It suggests you might be seeking validation or acceptance of your current self.
4. Nice Hotel Room in Berlin: Booking a nice hotel room can signify a desire for comfort and a temporary escape from reality. Berlin, a city known for its history and culture, may represent a journey of self-discovery or a desire to explore new opportunities.
5. Friend Smearing Feces: This is a strong and negative image that may symbolize feelings of betrayal, disappointment, or the fear of having your reputation tarnished by others. It could also suggest that something you once valued (like a friendship) has become messy or complicated.

Overall, this dream may reflect a journey of personal transformation, the desire for acceptance, and concerns about past relationships or how they affect your current life. Consider what aspects of your past you might still be grappling with and how they relate to your present circumstances. It may be helpful to confront any unresolved feelings or conflicts that arise from your past.