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.
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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.