Same as hindsight. Someone says they knew something all along after receiving information but they actually know nothing.
Woman: What's your sign?
Man: I'm a Leo.
Woman: I knew it!
Man: I'm actually a Capricorn.
Woman: That make sense because that is exactly what a Capricorn would do.
Man: You're post nutting I'm actually a Scorpio.
The feeling of lucidity a man gets after he has been beating it--this feeling gets worse with the weirder shit a man has been jerking off to
Jerry: Dude, yesterday i was watching wizard of oz and jacking off to it, and post nut clarity hit me hard when i realized putting my dick in a scarecrow isn't normal.
Brian: Jerry what the fuck
Abbreviated - PNS - A slang word for Post-coital tristesse. An issue that has been plaguing men since the dawn of time. It's the feelings of anxiety, depression, sadness, empathy, regret, etc, that one gets after busting a nut. Normally the condition is more severe depending on the sexual circumstances. It is caused by a decrease in dopamine receptors immediately after ejaculation.
- A guy finishes after banging a girl he just met at a bar. He immediately gets Post Nut Syndrome. He wants to just get out of there as soon as possible.
- You finish masturbating to an a kinky beastiality porn on your computer. Post Nut Syndrome comes on very quickly and you clear your web history and go make a milkshake.