An Anti-Social Behaviour Order (ASBO) is a court order that stops people from doing certain things that could make life difficult for other people or cause a lot of disruption. It usually means that a person has to stop going to certain places or doing things that bother or hurt people, or cause trouble for other people. ASBOs usually last for a certain amount of time - usually 1-5 years - and if you break it, you could be arrested and put in jail.