A midder is a University Level Exam that puts immense stress on the student, sometimes causing greasy skin/acne and general irritability. Is also known to impair speech and cause loss of volume control. Prolonged cases involve problems with digestion and bowel movements.
"Bernice has a mad case of the Midders, she has a greasy-ass face!"
"Ya I heard her trying to take a dump she must have been bombarded by midterms this semester!"