The horrible empty and longing feeling one gets when they come home from home from a CISV programme. Symptoms include google imaging your campsite, not speaking to non-CISV friends, excessive chocolate-eating, looking at your CISV pictures, and giving lots and lots and lots of hugs.
Random kid: Hey friend! How was that peace camp trip to Italy?
CISVer: Man, don't talk to me. I'm going through CISV withdrawl.