When you leave your backpack in your car trunk from 3pm - 8am.
I have senioritis; I didn't even need my backpack last night.
by asiu February 4, 2007
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when high school seniors get lazy, no longer give a damn, and just cant wait till school ends
1: hey can i copy ur hw? i didnt do it. i was sleeping in class yesterday anyway
2: i didnt do it either
1: ah, well. screw it. i dont really care. senioritis, man.
2: amen
by dana27 December 13, 2005
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A virus which seems to affect mainly second semester seniors, with few eceptions (First semester Seniors etc). This virus can be deadly to one's grades, as the carrier becomes totally apathetic about their grades, classes, homework etc. This results in many "Zeros ( 0 )" or failing grades - ultimately leading to the drastic lowering of the grade in the carrier's classes. Side effects include: Failure to give a shit, complete and utter apathy, and not graduating with the carrier's class.
Parent: Why did you fail this class?
Carrier: I didn't study.
Parent: Why?
Carrier: Senioritis
by synorgy February 15, 2005
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An action, usually negative (but sometimes funny) most often associated with people of a certain age.
One of Mom's many seniorisms is constantly losing her housekeys, which often turn up in some pocket or other. She's always stashing and forgetting.
by Ward Smith May 20, 2012
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(n) A widely-accepted concept which states that individuals who have been affiliated with a group for a longer period of time (and thus proven their dedication to the group) should have priority over newer members in matters such as rank and decision-making. It is applicable to many groups, especially those where such "senior" members have only a short period of time remaining before they are expected to leave the group, but does not work well in other situations.
Simon: Thomas, Justin is mad at me. He doesn't like that I attained a higher chair placement than him in THE prestigious Eagan High School Wind Ensemble!

Thomas: How dare he even consider the idea the chair placements that I so carefully determined could be wrong! Justin, just because you are older than Simon does not mean you have seniority!

Justin: But sir! You know very well that I am by far the most dedicated member of this fine ensemble, and I have been a member for the longest! I practiced for hours to prepare for my audition!

Thomas: I have a prestigious degree in music education from Northwestern! You shouldn't challenge the superhuman hearing abilities of what God gave me. Anyone who thinks they deserve a higher placement because of seniority - well, I hope the door doesn't hit your rear end on the way out!

Jeff: But Thomas, with such a solid audition system, Justin should logically be the section leader, just like I am! Right Brett?

Brett: Absolutely, Jeff! With you as section leader, the logically determined Eagan High School Wind Ensemble Percussion Section is destined for greatness, especially with my highly productive lessons! Unfortunately, because I don't have any seniority, I won't be around next year to see it.

Real Simon: That's a shame, because he was such an experienced instructor - and good looking, too!
by percussionist69 October 31, 2011
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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.
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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