A common disease which plagues high school seniors at one point during their last year in high school. Before they graduate, they are overcome with a lazy and indifferent attitude; uncaring of their studies. There are many different causes of the disease, but it can often be contagious between close friends. Often results in a change in personal style; from anything beforehand to sweats and baggy shirts. Hair is barely ever brushed; or for women, is up in a messy bun or ponytail. They might have many absences and a generally dismissive outlook towards any type of labor whatsoever.
Senioritis: we'd fight for a cure if we weren't so lazy.
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Susan: Hey, did you study for the English test?
David: Hahaha.. nope; House was on. What about you?
Susan: Nah, Mark came over and then we went out for Starbucks.. didn't have time or anything.
by jennanaa January 9, 2006
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Senioritis is a disease that affects all high school seniors. For most people it starts in the second semester of the senior year. Symptoms for the disease include: Unsafe sex, many beer bongs, getting arrested, showing up to school extremely high, drawing a five foot penis on the chalkboard, and telling you teacher she looks like an old crack whore. The only way to get over this disease is to walk the stage at graduation, or punch your principal in the cock.
Great senioritis movies: Fast Times at Ridgmont High and Ferris Bueller's Day Off
by Aarond87 May 16, 2006
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A disease that usually hits high school seniors after they have been accepted to college, or their mid-year grades have been sent out. Symptoms include not caring about one's studies or grades, complete and total lazyness, and skipping classes. Senioritis is usually cured upon graduation from high school. Once this occurs, the student realizes that he/she must do a lot more work in college.
Teacher: Ok guys, 13 of you didn't do your homework. Don't let Senioritis set in!
Student: Who cares, we've been accepted to college and we're graduating in two months!
Teacher: Well, colleges can take away your acceptance.
Student: No they cant.
by Tom Blake September 10, 2006
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Somebody who has worked their way up to a high level and can be classed as senior. Someone who deserves respect as senior man/woman.

Can also refer to older members of our society.
Anthony; Go and clean up over there please
Timmy; Ok you are more senior than me
by Maverick Corleone January 20, 2007
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A disease that occurs when high school seniors have applied to and/or been accepted to college. Senioritis cripples any and all drive to do homework, and seniors replace homework time with activities like parties, pranks, and reading about senioritis on Urban Dictionary.
I got senioritis after finishing my application; why would I want to write an essay for English? Let's go play tag.
by comintern December 14, 2009
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noun. A functional disorder usually affecting high school and college seniors "close" to graduation. Symptoms include : laziness, apathy, mass consumption of McDonald's and Americanized Mexican food, wasting large quantities of time on facebook, Instagram and Twitter, narcolepsy, absence of school materials, depression thinking about the next four years of school, diarrhea from eating too much Americanized Mexican food, loss of purpose, excessive partying and beer pong, reckless sexual behavior, sweat pants, beanies, non-matching socks (or shoes), non- aggressive aggressiveness towards school, nappy hair, ridiculous procrastination, neglect of hygienic activities, catching up on sleep, average GPA dropping by one or more points, dehydration and increased urination from binge drinking.
I got on my computer to do chemistry homework, but then I went to urban dictionary to see if my lack of motivation in anything was senioritis.
I found out I have senioritis, so then instead of doing my chemistry homework, I wrote the bajillionth definition of senioritis on urban dictionary.
I now had time to do my chemistry homework, but proceeded to edit my definition of senioritis on urban dictionary instead.
by Choborr November 30, 2014
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Senioritis is a colloquial term used 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 careers. By definition, Senioritis is not due to the direct physiological effects of a general medical condition such as hypothyroidism or insomnia but is typically said to include: slowness, procrastination, apathy regarding school work, a feeling of entitlement or privilege and a tendency toward truancy, increased drug use, malingering or feigning illness in order to avoid presence in a school setting, cognitive impairments, and changes in sleep patterns. Many high school 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." Even though high school seniors tend to be the bulk of the victims, high school juniors and sophomores are also known to have it.

Senioritis usually results in a withdrawal from school-related extracurricular activities and school spirit events and a reduced concern for social acceptance, instead focusing on graduation (and the end of compulsory school) in June and/or acceptance to college in September. It can also manifest as increased social and extra-curricular activity, which comes at the expense of academic duties, with the student preferring to "have fun" rather than work academically.
Jenny contracted Senioritis and began to smoke pot and skip classes. She failed all of her courses because of her lack of motivation.
by Sayuri T. February 7, 2008
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