Skip to main content
"Never date a co-worker." From the all-important (and sometimes hypocritical) rules of Leroy Jethro Gibbs of NCIS.
Ziva: "Tony, we cannot break Rule 12."
Tony: "Why not? Gibbs and Jenny totally did."
Rule 12 by dinozzosgirl February 7, 2010
Related Words
Romance between coworkers never works out.

(Originated from S.A. Gibbs' unwritten Rules, per NCIS)
TONY: I love you, Kate, but we can't break Rule 12!
KATE: Screw Gibbs and his rules! We belong together.
Rule 12 by MissNoodles June 23, 2006
Downloading unnecessary porn when you are horny, then deleting after finished.
After I finished looking at porn, I rule 12'ed the torrents I was downloading while horny and fapping, by going back after I was done and deleted the downloads in progress.
Rule 12 by Psilocybe Tim March 14, 2008
An amazing website similar to sythe(dot)org, but only in the sense that Rule-12.com is dedicated to Runescape cheating. This website consists of different forum sections pertaining to general discussions, graphics, computer programming etc. Rule-12 members are noticeably more respectful and polite than most other forum users. Overall, Rule-12(dot)com is the epitome of Runescape Cheating/Black Market websites.
Loser: Hey man, come to sythe!!!11!!

Better Person: And get hacked, scammed, and spammed? No thanks, i'll go to Rule-12
Rule-12 by Rule-12 December 28, 2008

12 Hour Rule 

The 12 Hour Rule applies to any sporting event where the male athlete(s) jack off exactly 12 hours before their competition. It is proven to raise testosterone levels and enhance performance for any sport.

It is important to not mastrubate too close to your competition, as this will not allow for enough time for your body to restore its testosterone supply. Too early, however, and it will have no effect on your performance.
It is not yet proven if this works on females yet. If anybody would like to test and contribute, be my guest.
Coach: "Okay guys, big race tomorrow. Everybody go home, eat a healthy dinner, and follow the 12 hour rule."
12 Hour Rule by pikalord November 7, 2010

12 am rule 

Anything said between 12:00am-1am is not to be taken literally if furthering the conversation will result in self incrimination.
Girl: “Omg did you hear how john called me a slut?”
Guy: “Yeah I heard, but he’s good because of the 12 am rule ya slut”