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1.
Senioritus is a medical condition experienced by all individuals between the ages 17 and 18. Around this time in the individual's maturing, they simply fuck their physics homework, and cross their fingers hoping graduation comes before their grades plummet.
Andrew was infected with senioritus shortly after winter break in the course of his senior year, and stopped showing up to class. He was quoted, "School is for squares!" Prior to infection, he had straight A's
by sir completely correct April 07, 2008
 
2.
Senioritis: (noun) A crippling disease that strikes high school seniors. Symptoms include: laziness, an over-excessive wearing of old athletic shirts, sweatpants, athletic shorts, and sweatshirts. Also features a lack of studying and a generally dismissive attitude. The only known cure is a phenomenon known as Graduation.
Jim contracted Senioritus in the second semester of his senior year.
by Senior 11 March 23, 2011
 
3.
When the students of the senior class think they are all superior to the entire world and dont want to do any work cuz it doesnt matter, theyre graduating soon anyway.
Tyler has senioritus because he thinks he is oh so cool and doesnt feel like doing any work because he is going to be out of here soon enough.
by Skelator101 August 20, 2010
 
4.
When a senior of a school gets sick of their school and the people in it.
I've been here too long.. i'm getting senioritus
by abcdefghijklmop34234234 May 02, 2006