A more thorough explanation:

Urban-Survival Syndrome is a self-defense theory that suggests a defendant who uses unreasonable force may be acquitted if they live in a dangerous environment that heightens their fears of injury to life or limb so much that the force used seemed reasonable and necessary to the defendant.

For example, if someone who lives in a high-crime area is attacked and uses excessive force to defend themselves, they may be able to use the urban-survival syndrome defense in court. The defense argues that the defendant's fear of being harmed was so great that they believed the force they used was necessary to protect themselves.

Another example could be a police officer who uses excessive force while apprehending a suspect in a dangerous neighborhood. The officer may argue that their training and experience in dealing with violent situations in urban areas caused them to use more force than necessary to ensure their safety and the safety of others.

Overall, the urban-survival syndrome defense is based on the idea that people who live in dangerous environments may have a heightened sense of fear and need to use more force to protect themselves. However, it is important to note that the use of excessive force is still illegal and can result in criminal charges, even if the defense is used.