Based on the provided paragraph, it's not clear what is an "outie". However, based on this sentence, "He rushes to tell Devon, but is only able to say "She's alive!" before Milchick tackles Dylan, deactivating the overtime contingency and reverting the three to their outie state.", it seems like an outie is a state that a person can be in and that the state can be switched on by deactivating the overtime contingency.