The very last year of high school. At the end of this school year comes graduation. Most kids are relieved that the hell of homework, drama, friends, and boring shit is over.
YES! I'm finally a high school senior! I've been in the fucking school system for the past 12 years. 12 years of hell! It's over! WOOO graduation!
by xxxcore April 5, 2006
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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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A senile old man or woman who has forgotten how to drive and is allowed far too many priveledges just for living through this hell we call life regardless of all their retirement benefits and 401k plans.
1. Dude, that senior in the Buick almost ran over my kid.

2. Old man: Can I have the senior discount?
Today's wayward youth: You just got a social security check for $300,000! Why should you get a discount?
Old man: Because I'm old.
Today's wayward youth: Go to hell!
by Timbolicious November 20, 2007
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your grandad
I reacurred my senior cause - they remember me,
My grandfather still smokin Weed and he's 70

Lloyd Bank$ send ya to hell
by shadow211 January 8, 2009
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1) A slut. One of the biggest whores you have encountered in your life thus far
2) The last year of high school, when all hell breaks loose and morals are no longer an issue (at least until you start college)
1) Oh my god! Kim is such a senior. Cutie & her totally sucked each other up last night. And this morning. And OH MY GOD, LOOK OUTSIDE! THEY'RE DOING IT RIGHT NOW ON YOUR LAWN!
by Bachelors Masters & Citizens February 1, 2009
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A disease affecting mostly high school seniors.

symptoms include:
- laziness

- lack of motivation

- excessive absences in school
- putting off assignments till the very last minute (more than usual)

- feeling of hopelessness

- thoughts of giving up

- feelings of not caring if you graduate or not

- STRESS a lot of stress
- more stress
- constant tired feeling
- irritable about everything

- panic feeling

The only cure for senioritis is to graduate or drop out.
teacher: essays are due by Sunday night at exactly 11:59pm

senior: *starts essay at 11pm and panics till 11:57pm when they submit essay* thanks alot Senioritis
by Mrs. Hemmings October 10, 2015
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