When someone, typically a girl feels miserable after hooking up or talking to many guys at once. This girl usually seeks validation from guys and plays people to hide the fact that she's insecure and sad deep down inside.
The feeling you get after breaking up with a slut. This includes reminiscing, regret, and flashbacks of things you've done with her.
"Dude, I can't stop thinking about her. It was such an amazing night... but I should completely forget about her. She's such a dirty whore... Ugh. I can't get over my Post-Slut Disorder."
Hey, did you hear about Sophie? Her and Joe broke up. She's been going home with a new guy every night! Hell, she's even been banging the girls! Damn, she's got that Post Traumatic Slut Disorder (PTSD)!!