Columbine Catastrophe 

An alternate name for Reaper's ult in Overwatch.

Player: I just Columbine Catastrophe'd their entire team!

Columbine Catastrophe by Zaeglamesh June 6, 2016

Columbine High School Massacre

The Columbine High School massacre was a school shooting that occurred on April 20, 1999, at Columbine High School in Columbine, an unincorporated area of Jefferson County, Colorado, U.S. (Wikipedia)

Date: April 20, 1999
Location: Columbine High School, Colorado, United States
Total number of deaths: 15 (including both perpetrators)
Shooters: Dylan Klebold, Eric Harris
Perpetrators: Eric Harris, Dylan Klebold
Weapons: TEC-9, Hi-Point Carbine, Knife

Columbine High School Massacre was a Devastating Event, taking away 15 lives, including those of the perpetrators. It was found, nonetheless, that the perpetrators, Dylan Kebold and Eric Harris, were depressed and constantly bullied at school.

Columbine High School Massacre by The Canadian Textbook February 24, 2018

Columbine Font 

On any instant messenger, bright green font with a black background. Usually Comic Sans, size 12, bold. The font of repressed murderers everywhere.

Jason uses Columbine Font. He's a creep

Columbine Font by Frathouse September 23, 2009

COLUMBINE MUSIC 

A type of music that was thought to have made the kids at Columbine want to kill people.

Most of the C.D.s he recieved for his birthday were of Columbine Music.

COLUMBINE MUSIC by Anonymous August 12, 2003

columbine kid

A kid who has the potential to become a school shooter. Usually socially outcast and depressed.

Dan has no friends and people make fun of him all the time. He may become a Columbine Kid.

columbine kid by Drew24592 May 15, 2005

columbine mode

An individual, or individuals, loosing their shit and killing without discretion.

While playing multiplayer FTP games:

"Can we get some teamwork here, or is everyone in columbine mode?!"

columbine mode by masstack June 9, 2005

Columbine High School 

A high school outside of Denver, Colorado. Just a perfectly normal, stereotypical high school, until a couple of sickos shot up the place. The death toll stood at thirteen, but if you count Dylan & Eric, the shooters, it came to fifteen.

See also: Columbine, school shooting.

It's a good thing Dylan and Eric's duffel bag bombs didn't detonate, or the Columbine High School library would've fallen into the cafeteria, killing hundreds.

Columbine High School by Baraldo.Jefferson February 14, 2007