Split into two types:
Type 1: When a female is currently at the egg releasing stage of the menstrual cycle
Type 2: An adjective used to describe a wide variety of actions and phenomena where the subject is both mental and sensual.
(To differentiate between the types the shorthand T1 and T2 can be used)
"Don't mind her she is quite menstrual at the moment."
! That meal was completely menstrual!"
Person 1: Mate that girl is fiiit
Person 2: Hells yea, she's completely menstrual.
Person 1: What?
Person 2: T2 mate T2.
Person 1: Damn right, she is a menstrosity