A more thorough explanation:

jus sibi dicere

jus sibi dicere is a Latin term that means to declare the law for oneself or to take the law into one's own hand.

If someone takes the law into their own hands, they are acting as judge, jury, and executioner. For example, if someone steals from you and you decide to punish them yourself instead of going to the police, you are jus sibi dicere.

Another example is if someone is being bullied and they decide to fight back instead of reporting it to a teacher or parent. This is also an example of jus sibi dicere.

These examples illustrate how jus sibi dicere means taking the law into your own hands instead of following the proper legal procedures.