As a Noun: 1. A person who betrays the trust of others by telling people in authority about the goings on of their peers when they involve either secrets or wrong-doings such as the breaking of rules, regulations or laws. English = pimp, blabbermouth, informant. As a Verb or Adjective: 1. To tell people in authority about the goings on of your peers when they involve either secrets or wrong-doings such as the breaking of rules, regulations or laws. English = pimp, blab, tell tales, inform on.