75% Rule 

The rule that states if you are hooking up with a girl and you pull your junk out, she will either touch it, suck it, fuck it, or push it away. There is a 75% chance she will do something.

Dan: Yo, I was hooking up with Trinity last night, and I totally 75% Ruled her
Jon: What'd she do?
Dan: I got a handjob

75% Rule by JZBURGER May 6, 2014

The Dave Rule 

A rule that defines the number of times (Twice) two people can hook up with one another before it becomes more than a random hookup

Man I hooked up with Mel last night!

Thats the second time you've hooked up, you gotta apply The Dave Rule her bro, else you're gunna be in a relationship!

The Dave Rule by yogi_b September 25, 2010

500 mile rule 

If you are more than 500 miles away from home, you can have sex with any nasty pig that is willing, because none of your friends will ever find out.

My shame and guilt were alleviated by my faith in the validity of the 500 mile rule"

500 mile rule by Vitriolic X August 15, 2011

Ja Rule 

Should have been on the soundtrack to passion of the christ.

It's murdaaaaaaaaaa

Ja Rule by IReallyDespiseJaRule,YaKnow? April 29, 2004

Covid Rule 

When a thin majority or weak government declares a nationwide state of emergency as an excuse to curb the spread of the coronavirus to hang on to power, or to prevent the administration from collapsing.

Malaysian PM resorts to Covid rule to suspend the parliament, thus preventing any elections to be held during the emergency, which could last until 2022, when the situation returned to normal.

Covid Rule by Covido January 12, 2021

The Rule of Backtracking 

The Rule of Backtracking mainly applies to the game Dead Space, where the player does a lot of backtracking throughout the levels. Basically, if you leave an area where you've killed monsters and then come back, those monsters will have mysteriously respawned. It's handy for players to know, especially on Impossible Mode, that just because you have cleared out an area does not mean that it's totally safe for the rest of the game.

Pedro: What the heck is this crap? Man, I swore I cleaned out this area, and now there are more monsters! I don't have any med packs left!
Napoleon: Dude, the Rule of Backtracking, man.
*player is mauled to death by a Necromorph*
Napoleon: Told you.

The Rule of Backtracking by Bob Smith Etc. July 27, 2009

Cardboard Rule 

Rules governing sexual behavior, which start out with good intentions, but when the rule-maker becomes wet said rules fall to pieces, much like cardboard.

I had a cardboard rule about not fucking strangers but when Jeremy went down on me, it totally fell apart.

Cardboard Rule by MrWigglesIII May 29, 2010