A female who is currently undergoing PMS
, or her menstrual cycle
An angry period monster, or APM, often exhibits the following characteristics, including, not but limited to, violent mood swings, irrational behavior, frequent irritating text message sending, being annoying
, ruining your day, destroying your concentration before a test, and just being an overall bitch
Also called angry menstruating
monsters, or AMM's (pronounced "AY-DOUBLE M").