Convention-down

Also known as "con-down". The feeling of sadness you get after a convention is over. What type of convention is irrelevant, as long as it is a group of like-minded people that you feel like you belong to.

Can also be used to describe the feeling of loneliness after having spent time with a partner, especially in a long distance relationship.

Person 1: Aww man, I wish that convention lasted longer...
Person 2: Dude, you have convention-down.

---

Significant other: I had really bad con-down for a week after my girlfriend flew back home. Especially because we won't be able to see each other for two months.