A common virus that infects all teenagers usually in their second semester of the school year that may cause them to sleep, slack, and generally not pay attention in all of their classes until their teachers become annoyed with their lifess presence.
I have been infected with senioritis and can no longer continue my school work.
by Yeslec January 15, 2009
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Senioritis: A term used colloquially in the United States and Canada to describe the decreased motivation toward studies displayed by students who are nearing the end of their high school or college careers. It is typically said to include slowness, procrastination, apathy regarding school work, and a tendency toward truancy.

Many high school and college students find themselves in a type of lame duck situation: their plans are made and a new chapter in their life is about to begin, so finishing the current chapter (the current term separating them from graduation) becomes just a formality or "holding pattern."

" Because now we have a better excuse to skip class and were starting early"
by hotice February 1, 2008
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When seniors in high school begin to not only be sick of school, but also of their fellow classmates.
"I used to really enjoy hanging out with Sarah, but after four years of dealing with her antics, I've realized that my senioritis has really turned me off to hanging out with her! She's so annoying!"
by Melanie. December 29, 2005
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Senioritis: The crippling disease of not giving a fuck.

Symptoms: Not giving a fuck
"Jimmy hasn't given a fuck for weeks!
It's okay, he has Senioritis."

"Johnny hasn't shown up for class all week", "Yeah, I know man, Senioritis hit hard this year."
by bagelskill September 13, 2011
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Adj. The feeling that one has after applying or being accepted to college. WARNING senioritis may cause students to: loose focus, stop taking notes, stop bringing note books, stop bringing bags, not care at all about tests and grades, and feel massive urge to revert back to preschool behavior (this includes napping at inappropriate times, and coloring in hello kitty or disney princess coloring books).
Amy: Did you study for the McCully Test?

Emily: No I have been coloring instead, it seems like a better use of my time.
Amy: I can't wait to hear back from schools, then I can have senioritis as bad as yours.
by Emmiebeee January 15, 2010
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A condition typically affecting high school seniors, resulting in the loss of basic motor skills such as: attending class, doing homework, and giving a shit.
Teacher: Can anyone give me an example of senioritis?

Class: Eh.
by AnnihilateAllHumans April 27, 2016
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A crippling disease that strikes high school seniors. Most cases of senioritis tend to start after college applications and mid-year reports have been sent in. This entails a student not doing any work whatsoever, dismissive attitude, increased absences, general laziness, an over-excessive wearing of sweatpants/sweatshirts & resentment towards taking all those hard classes to impress a favorite college which the student most likely won't attend because of how expensive it is. The only known cure to senioritis is a phenomenon known as GRADUATION.
Teacher: Class, here's a 10 page essay on insert cruelly long & boring novel here to be done by Friday.

Class: Fuck this shit, it's April & my senioritis kicked in about a month ago.
by MommaMayI May 17, 2010
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