Dreams about slipping or falling often reflect feelings of insecurity or a lack of control in certain areas of your life. In your case, slipping in the hallway at school may symbolize anxiety about your academic or social environment. It could imply that you're feeling overwhelmed or unprepared for something coming up, such as an exam or social interaction.

The presence of your friend suggests that you may have support in your life, but the urgency of needing to get to class indicates a pressure to meet expectations. Being grabbed and thrown by robots can represent feelings of being controlled or manipulated by external forces, possibly reflecting fears about being judged or evaluated in a mechanical or unemotional way.

Overall, this dream could be highlighting your feelings of vulnerability and external pressures within your school environment. It may be helpful to reflect on any current stressors you're facing and consider how you can regain a sense of control and support in your life.