When one can not perform regular daily functions once he/she returns from the Coachella Valley Music and Arts Festival. The 3 day weekend was so awesome that he/she is depressed with ordinary life and is now unable to think or act on anything except festivities related to Coachella.
“My friend hasn’t gone to class all week. I believe the doctor diagnosed him with Post-Coachella Syndrome. He has taken a medical leave of absence from school for the next month!”