The brain disease you get at the end of your senior year.

The poor thing let her grades slip at the end of the year.

Yeah, I heard she came down with a bad case of Senioritis
by 8089364496 January 30, 2009
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Noun. A crippling disease that strikes high school seniors. Symptoms include: laziness, an over-excessive wearing of t-shirts, sweatpants, athletic shorts, and sweatshirts. Also features a lack of studying, repeated absences, and a generally dismissive attitude. The only known cure is a phenomenon known as Graduation.
Why didn't you study for Mr. Hames Test?

Oh, who studies for a test anyways. I got senioritis.
by Jordannnk November 3, 2015
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A disease that affects high school and college seniors in the second semester symptoms include bad decisions, laziness, constant tardiness, lack of studying and in rare cases even use of drugs I. E. Pot
u have seven F's on your report card!!?

Ya

Y

Senioritis
by @Chickentastesgoodlol December 16, 2015
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The mindset of not needing to do anything such as, succeeding in school or participating in any events.
Example: "Penny got straight C's this semester, she must have senioritis."
by K8. M October 23, 2013
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When your in your very last years in college, where your emotionally drained, you have no care in the world, anything and everything irritates you, you often skip class, lazy and tired aren't even the worst of it. A student will find himself/herself lazy and very sleepy. Your emotionally, physically and mentally drained. You tend to skip doing homework and try and stall by doing something else.
A college student who has senioritis would find themselves sleeping in their cars more when they should be at work and or in class.
by princess_ohana March 28, 2018
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Senioritis is a disease that affects approximately 95% of the senior population during their second (and last) semester of high school after receiving acceptance letters from the colleges/unversities of their choice. During this time, affected persons may experience lack of motivation, a major decline in fucks to give, and a burning passion to get the hell out of high school.
John: I haven't handed in that Biology assignment yet.
Mallory: That was due 3 weeks ago!
John: It's not me, it's the senioritis.
by princess787 May 22, 2017
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Something commonly found in high school seniors, that ive had since freshman year.
Senior: Dude your a sophomore?
Me: Yeah.
Senior: I had no clue, you have major senioritis.
Me: Man ive had that since i got here
by Por Que!!!!!!!!!!! June 24, 2011
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