An anger holder is a headmate who holds anger for the system. This can involve lashing out at random times and not handling the anger in a healthy manner. This could have overlap with a persecutor, prosecutor or protector in some cases. It is a type of emotion holder.[1]
An example of an anger holder could be a headmate who takes the front to lash out about something making themselves or another headmate mad.
While we weren't able to find a direct source, Pluralpedia attributed coining to Hellscape Collective. The page was created on March 14th, 2023, so coining was during or before 2023. A flag was created and uploaded to Pluralpedia by Pluralpedia user the Werewolf Pack on December 20th, 2023.