Disruptive mood dysregulation disorder
Disruptive mood dysregulation disorder (DMDD) is a mental disorder in children and adolescents characterized by a persistently irritable or angry mood and frequent temper outbursts that are disproportionate to the situation and significantly more severe than the typical reaction of same-aged peers. DMDD was added to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) as a type of mood disorder diagnosis for youths.
Source: Wikipedia — Disruptive mood dysregulation disorder (CC BY-SA 4.0)