The highest possible rank in the high school hierarchy. Fourth years are the best of the best - they've survived three years of being mocked by the grades above them and are determined to make the three years below them suffer the same way. They've got power, connections, sometimes weed, and a shitload of exams coming their way, which they'll likely either completely ace or completely fail.
Guy 1, pointing at another guy: Who's that?

Guy 2: That's a senior. I don't remember his name, but we should bow while he walks by or he'll get his connections to murder us.

Guy 1: Oh shit.
by RuRiJoMai January 31, 2017
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when people are placed in a higher position solely based on age. This concept is unfortunately present in many high school sports teams, especially tennis teams.
person 1: hey did you make varsity?
person 2: no
person 1: why?
person 2: seniority
literally every person ever: ohhh, that sucks
by John Doe 37391833910 November 13, 2019
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Seniors are made to destroy any self confidence that freshman may have gained in their past 8 years of schooling. And they do a fantastic job.
by jesssicannnn7 August 5, 2010
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Last year of high school. Basically there to tear shit up. Last chance to not give a fuck before stepping out into the real world. Last homecomings. Last chance to play sports for some of us. Last chance to show people who you are. The year where you go balls out.
Freshmen girl- "OMG is he a senior?!"
Other freshmen girl-"yes"
Freshmen girl 1-"What a badass"
by marissaandjosh;D July 23, 2012
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The feeling you get when you have a college acceptance letter in one hand, a Cinnabon in the other hand, and you jack it with both hands and skeet all over your bookbag and homework.

Of course, you don't have the motivation to clean off your stuff anytime between 3 PM and 7 AM the next day.
The diary of an infected senior:

Dear diary. I have finally come to terms with my life-threatening case of senioritis. And while my parents and teachers tell me I should "get back on the horse" and study hard, I can only spit out the battle cry of my generation:

SENIORITIS: We'd find a cure, but we just don't fuckin care.
by TheSkankyBrown April 15, 2010
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symptoms of senioritis are variable. 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, skipping class a lot, getting stoned/drunk for the first time ever, being apathetic about everything, and resenting taking all those hard classes to impress your favorite college which you won't get in most likely because it's too expensive.

Also, seniors with senioritis tend to play pranks on others, sometimes doing thinks that they would never consider doing. But its alright because detention is alright after your mid-year reports are sent in.

Senioritis has been documented in a significant minority of seniors usually at the end of the 4th quarter of the junior year. This entails that the student usually doesn't do his college essay unitl the last week before the college applications are due. However, the student feels very smug because he got away with it.

In other cases, senioritis may show signs early on in birth, then progressing in elementary school, middle school, and the beginning of 9th grade. This usually means that the student goes to a bad school where he or she (usually he) has to take stupid, nonsensical courses, and question the validacy of the system.

Senioritis usually can be diagnosed by the student himself or by colleagues of the student such as a teacher.

Treatment for senioritis: Continue to slack off for the rest of the senior year, doing whatever you want. Usually graduation is the pinnacle for the end of senioritis for the student effectively becomes a college student and has to work hard otherwise he works at Burger Shack.

In some cases, treatment may not work, and the student may exhibit senioritis in college. In these cases, it is adviseable for the student to do research on "procrastination" and possibly visit a psychiatrist for further treatment.

Senioritis affects everyone, regardless of sex, age, height, race, etc. It happens naturally like chicken pox, or diarrhea.

Often the quote for seniors with senioritis is, "Whateva, whateva, I'll do what I waunt," as exhibited by the senioritic Eric Cartman from the show South Park.
My senioritis started around the beginning of 6th grade when I didn't do many assignments until 9 pm. I thought this was procrastination but I learned otherwise (when my teacher found out I watched the movie instead of reading the book).

"Whateva, whateva, I'll do what I waunt, whenever I waunt." ~ Eric Cartman

"Why didn't you do your math homework?

"Oh, who studies for a math test anyways. I've got senioritis"

Fei Xu, a colleague of mine, skipped gym class to play ping pong with the handicapped.

You have a 10 page research paper due tomorrow, and you don't care.

You have a 10 page research paper due tomorrow, BUT you have a snow day tomorrow, and you still don't do it on the snow day.
by hkiehs February 14, 2005
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seniors in high school, who don't give a shit, count down til graduation day, give up on almost everything, get into the most trouble, dislike every junior, and basically says "fuck it."
The seniors plan their senior skip day for every month.
by hilaryx8 April 3, 2008
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