Occurs a little before or during a girl's period. It basically makes you feel like crap for anywhere from 2 to 5 days.
Let me put it this way, if men had to deal with this, the international suicide rate would be a lot higher.
It can causes any or many of the following symptoms: mood swings, low self esteem, headaches, cramps from Hell, bloating, snapiness, fatigue, muscle/joint aches, food cravings, heightened thirst, nausea, stomachaches, more frequent crying, insomnia, boob tenderness, acne break outs, or even nightmares.
I don't suggest teasing your girlfriend while she's go through this.
Girls may celebrate its completion with ice cream.
Dude, don't mess with Stacy right now, she's PMSing. She'll bite your head off!
It is a humorous term intended to be confused with the scientific Pre-Menstrual Syndrome (the original PMS), especially when used by a male.
Mike: My Post-Midnight Snack.
Joe: Wha-? Ohh.
Phil: I think I'll have my PMS soon.
Linda: Jerk! Are you making fun of me?
Phil: What? No! I'm just gonna heat up my Pre-Midnight Snack!
Linda: Hahaha, that's... clever.