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The depressed feeling you get after going to a convention and seeing friends. The afflicted usually desperately text or call everyone they know from the convention, spend ridiculous amounts of time on facebook and forums where they find their friends from the convention, and go over every memory hundreds of times.
Man, now that PortCon is over I have some major postcon blues.

I'm dreading the postcon blues feeling I'll have next week.
by LosahLosah June 28, 2011
The feeling of sadness that comes from leaving an anime convention and returning home to your original, normal life.
Ever since I got home from Otakon, I caught Post-Con Blues, and I haven't been able to get anything done.
by Ari-Man August 12, 2008