Noun. The excuse women use to deflect any sort of blame off of themselves when acting irratically; a defense mechanism as to not take responsibility for their actions.
Girlfriend: "I'm sorry baby, I know I did things behind your back -- lied, cheated, screamed at you and had another man's baby... I don't know what I was thinking... My hormones must just be ridiculous right now, omg!"
Boyfriend: "Bitch don't feed me some bullshit insanity defense. Call it your whoremoans and maybe we can agree on something for once."
similar to the brain function "hormones". Only, whoremoans are when platonic male friends of females decide they want to jump the river & cross the line. Then when the girl gives in because she doesn't want to be rude & ruin their friendship, this is "whoremoans".