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"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
IF its Digital Its free.
There a lot of music that is Rule13
Rule13 by LW-13 June 15, 2011
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
ownish ruler who is known for ruling people 22 times IN A ROW!! OMGWTF!
i ruler22ed you. I am a ruler22. I own ruler22 style.
ruler22 by monk October 16, 2004