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The two highest grades in High School before College. They are Juniors and Seniors, and are absolute dickheads to lowerclassmen just because they exist. However, not all are this way, but most of them that you'll meet will hate lowerclassmen for no reason. Once lowerclassmen become upperclassmen, they want that feeling of power, and will repeat the harassment that the previous upperclassmen did to them.
Upperclassmen: Haha! You lowerclassmen are nothing but mislead fucktards that don't know your place! We will pick on you, treat you as inferiors, and make fun of you until we leave out of this fucking dump for good! Pick up my shit, hand it to me, and don't make us mad!
by ShxdyNeo May 14, 2019
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(high school) Upperclassmen are the 2 highest grades of high school. The Juniors, and the seniors. Juniors and Seniors are the big grades of high school. Sophomores are not yet upperclassmen but they're more respected than Freshman. Freshman look up to upperclassmen. Many Freshmen feel intimidated by upperclassmen. But its good for the Freshman to *try* to get on their good side.
The Upperclassmen and the Freshman.......(STORY)

Freshman: "Hey whats up? I heard theres a party tonight, can you tell me where its at?

Junior: Um...Your a freshman right?

Freshman: "Yeah"...

Junior: AAAHAHAHAHAHAHAHA!

THE EEENNNDD!!
by FlyLikeABird July 19, 2009
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The Juniors and Seniors of a high school they are attending. In other words, eleventh and twelfth graders.

Often they are feared the non-upperclassmen, usually freshmen.
Eleventh Grader: YES! We're eleventh graders! That makes us upperclassmen!!!
Ninth Grader: Uh-ohh.... I'm afraid of getting in the way of an upperclassmen....
by xairbearx June 29, 2009
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Upperclassmen are the juniors and seniors in high school or a 4-year college. Freshmen are often intimidated by them, due to the upperclassmen being older than them and knowing everything more than they do.

Sophomores are still in the underclassmen ranks, but appear to be more respected than the freshmen. Usually when school is out for the summer, the sophomores are excited to become upperclassmen (aka: juniors) the following year. The juniors are excited to become seniors, and the freshmen are worrying about what will happen to them when they become sophomores.
Here's a story...

Sophomore 1: Hey, school is out! And in 3 more months, we will be upperclassmen! Also known as juniors!

Sophmore 2: Ikr! It's gonna be so cool! We can be twice as cool like the seniors!

3 months later...

Junior 1: Yes! We are officially juniors! Lets go scare some freshmen, shall we?

Junior 2: Hell yeah!

After the prank...

Freshman 1: Why do upperclassmen have to be so mean?

Freshman 2: Probably, because they think that they know everything more than we do
by JellyBean600 June 20, 2018
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10th,11th,and 12th graders in high school who think they have the right to be complete assholes and be jerks to all of the freshman just because they have been there longer.
upperclassmen:freshman suck!
freshman:your dating one....
by sarahhhhhhhhhhhhh May 20, 2007
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people who are "upperclassmen" aren't immature 9th graders. they are seniors and juniors, or the top grades in a school. everyone other than the youngest. freshman in high school are not upperclassmen, and shouldn't call themselves upperclassmen. 6th graders are basically the same social status as 9th graders, if not better.
"wow 7th grader you can't be mean to me. you're talking to an upperclassmen"-freshman
"actually you arent cool and your a freshman, not an upperlcassmen. you aren't a senior or junior, yeah your not coool."-7th grader and the rest of the world
by sg_em_rb_ninthgraders_BFF2 March 14, 2010
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