12/5 

Some stupid cunt thought that Marines were always saying "December Five" when they were actually saying "Semper Fi" which is the Marine Corps motto for "Always Faithful" This bitch asked the question on Yahoo so now Marines say "December Five" because it took off and is rather hilarious at how stupid this bitch was.

Shortened version is 12/5.

Marine 1 in a text message: "12/5"

Marine 2 in a text message: "12/5"

12/5 by GruntLife July 11, 2011

12/5 

Red Axe Festival
A holiday
Created by Hi_Chocolate

12/5 is the best day ever!

12/5 by AGuyWhoHaveBigDick November 15, 2018

12.5-tuple-fourth-cousin 

12.5-tuple-4C: Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents, zero great-great-grandparents and twenty-five great-great-great-grandparents in common.

My 12.5-tuple-fourth-cousin is a good person.

12.5-tuple-fourth-cousin by ABGR June 9, 2021

19-5-20-20-12-5 

The numbers of the letters of the alphabet that spell the word "settle" as in "settle down". By saying this to someone, they will stop doing whatever they are doing to figure out what the numbers mean, thus settling down.

Guy 1: OH MY GOD, YOU'RE SUCH A DICK!!!!!!
Guy 2: 19-5-20-20-12-5
Guy 1: Wait, what? *starts counting*

19-5-20-20-12-5 by veronicalovin October 24, 2009

5-12 

5-12/512 is Latin slang for oxycodone

5-12 es una tema popular q refiere a la oxicodona, un analgesico muy potente.

"Pero en mi cama se volvió un vicio como la 5-12" -Jhay Cortez

5-12 by trapstar8 January 7, 2023

5’12” 

A guy who says he is six-foot or over, but is clearly under six-foot

Judy: how did your tinder date go?
Celine: it was fine, but it turns out he was 5’12”.
Judy: ohh, another short guy in disguise.

5’12” by Gstr34m May 8, 2020

5’12” 

When you’re 6’00” or taller but you still get no matches on Tinder.

No one wants to date a 5’12” incel.

5’12” by MaybeARealWord January 22, 2022