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1.
- noun. Uncontrolable inability to stop moving and dancing, usually experienced after attending a kick ass festival. Symptoms may also include loss of voice, incessant humming and a greater love for the outdoors"
Use in colloqial terms:

Marc: "What's wrong with you dude? Your Shaking like a leaf?

John: " Dude, Just came back from this kick ass music festival, sang, danced and drank way too much! Now I can't stop moving and thinking of that Boys Noize Set"

John: I think I have festivalitus!
by The Secret Assasin ! July 07, 2009