shiny upperclassmen syndrome 

When a boy becomes more appealing to a girl simply because he is older than her, specifically if he is an upperclassman (junior or senior in high school). It seems many younger girls are drawn to older guys for this reason, even if he doesn't really have much else going for him. For girls, dating up is somewhat prestigious.
I suppose this could also apply in college, but I have not yet come across that scenario.

"Why does she even like him? He isn't very cute and his personality is just so-so..."

"She must have shiny upperclassmen syndrome."

shiny upperclassmen syndrome by apersonfromnova January 11, 2012

Upperclassman

Someone who is older than you, or higher than you. Translated it means senpai in japanese.

"He greatly respects Mamoru, who is an upperclassman at his school."

Upperclassman by KattTheWeeb August 1, 2018

underclassmen

usually meaning the lowest grade of students in a school.(9th,10th,11th grade is also debatable, for examples)
in movies and t.v. shows, they are usually depicted as beady eyed kids that for some reason envy the upperclassmen almost as if they are god amoungst men..
but in real life they are generally ungreatful little snots that think they are tough/cool.oh and i never said they are all like this...

underclassmen

underclassmen by y2c March 2, 2011

upperclassman

Any student in a high school other than a freshman. These students are usually pretty normal, but for some of them, the evolution from frosh to non-frosh makes them into total jackasses. These jackass-upperclassmen should be avoided by freshmen at all costs.

Upperclassman: Hey, you're a freshman, right?
Freshman: Uh ... yeah?
Upperclassman: Go clean the floor with your tongue.

upperclassman by Duskmoon December 20, 2008

Underclassmen

Children who are obsessed with making pointless Facebook statuses, usually consisting of "LIKE DIS STATIS IF U WANNA B IN MY BOX!!!" or "Omgg he dusnt liek me....**** lol (:" and potentially causing social problems/embarrassing themselves (you can't spell embarrass without ASS!) by copy/pasting pictures of themselves next to some other child in Microsoft Paint and attaching a stupid caption written in Comic Sans asking people to pick who is more attractive, then tagging random people in said picture on Facebook. Belong on MySpace with the other children.

7th grader: HiiIIi guiseee<33 v0tE FOR Me in MEE vsss KYALEIEaAaAAa....<#33***
8th grader: oMGGGGGG LOL your pix is cuteee<3**&F/ehd
9th grader: HEY L0L GIRL<3 ADD ME T0 UR BOX WHORE333 LMAOOO
10 grader: co0oo0ol. going to bed. your stiupid. don't text.*
Everyone else: Shut the fuck up, you stupid underclassmen.

Underclassmen by yesimad October 24, 2010

upper classmen

10th, 11th, and 12th graders. Most of which make fun of 9th graders.

Upper Classmate: Yeo freshmeat!

Freshman: uhhmm.. *quivers*

upper classmen

upper classmen by Danielle d. l. October 13, 2008