The sleep-deprived, zombie-like disease of a high-school junior who has overdosed on AP or honors classes and extracurriculars.
A person with junioritis exhibits characteristic tendencies such as caffeine dependence, poor posture, a bleak social life, and basic hatred for anyone without homework. Used as a noun or occasionally as an expletive, if said with enthusiasm.
I was up until three this morning writing an argumentative essay and studying for an AP history exam.
I've got horrible junioritis.
OR Junioritis! Who the heck drank all the Pepsi?