school night 

To have commitments the next day, esp. in the morning, eg interviews, work, dates etc, that prevents you from doing something (usually fun and stupid) on that night.

Originated, (obviously) when having to go to bed early because school was the next day.

I'd love to get drunk and stay out all night with you guys, but it's a school night!

school night by ph@11u55y June 26, 2009

School Night 

An excuse to prevent from doing an immediate action or otherwise on a later date.

See, I would punch you in the face for steeling my tater tots, but you know what .... its a school night

School Night by Larbac August 17, 2010

School Night Vibes 

When everybody in the group chat is sending dumb shit avoiding their responsibilities for the next day. Founded by EB, typically applies to Snapchat group chats later than 10 pm

“This some School Night Vibes right here”, Sameh says after Rajan finished talking about how he would fuck Evan, “For the boys” while procrastinating his Physics Lab

School Night Vibes by formerjuicyback September 22, 2019

Night School 

(Not referring to the movie) Adult/GED Classes that are held in the evening for people who can't attend during the day due to being a parent, working or high school (if you're 18 and attending both).

People who attend to Night School (or Adult School in general) are either getting their life together by catching up on their high school credits or who immigrated to this country to be successful, learn English, and get their diploma (or GED) in order to get a good job (or head to Community College/University if they choose to) so it's the best available option if you didn't finish high school and want to get your Diploma or you can get your GED.

Night School by Don't get me in trouble January 12, 2019

Night School 

A sure-fire way to graduate on time.

If it weren't for night school, I wouldn't've graduated.

Night School by Butteesha Jenkins August 31, 2004

Night-before-first-day-of-school syndrome 

That feeling when you can't sleep the night before the first day of school

Guy 1: ugh i can't fall asleep and its 12:20

Guy 2: Seems he's got Night-before-first-day-of-school syndrome

Night-before-first-day-of-school syndrome by Redsoxsuck04 August 6, 2014

School Nighter 

Fucking on a school night (and you have to get up early to go to school or class the next morning; more for high school and college students than anyone else)

P-Phat and Becky had a school nighter last night and as a result P-Phat was late for class today.

School Nighter by MOCO & P-Phat February 11, 2009