The paranoid and irrational belief that there's always a better, cooler, hipper party going on somewhere else that you can never get to.
Jez: This party is just great, isn't it?
Mark: Don't try to hide it Jez, you and me both know that you're suffering from Cosmic Party Syndrome right now.
Mark: Don't try to hide it Jez, you and me both know that you're suffering from Cosmic Party Syndrome right now.
by Wantai September 23, 2012
Get the Cosmic Party Syndromemug.