Rule 0.0 

There is a rule for it. If there isn't there soon will be.

Rule 0.0: For a few weeks there there was no official rule for "there is porn for it" now we just say "Rule 34"

Rule 0.0 by yelnats yllib January 8, 2012

Rule 0 

The unwritten rule of tabletop Role Playing Games:
The Game/Dungeon Master has the right to veto anything any player says, he has the right to change any rule or make up his own, he need not explain why he choses to do these things. If players complain the GM may choose any of the following to do to the player; slap, call a dumbass, restrict snackage privileges and/or threaten injury to ingame character(be it through loss of xp, health, items or gold)

Player: Can I make my own species for my familiar
DM: Hells no! I'm gonna have to Rule 0 that one
Player: Bitch
DM: I swear I will cut you off of the mountain dew boy
Player: I'm sorry master.

Rule 0 by Cecil Helden December 28, 2007

rule 0 

a.k.a. "The GM is always right."

The unwritten rule in tabletop role-playing games (such as Dungeons & Dragons) which grants the game master the right to suspend or override the published game rules whenever s/he deems necessary.

Similar to a house rule; however, rule zero may be invoked unilaterally, at any time and does not have to be agreed upon in advance by the players.

When abused, can lead to an inconsistent, confusing, or frustrating experience for the players.

Bob: I climb up the wall and into the wizard's castle, bypassing the defenses. I rolled a 20, so I succeed.
GM: The wall is magically warded against climbing. You fail.
Bob: But a 20 is an automatic success!
GM: Rule 0. You fail.

rule 0 by bigwhitespats November 2, 2009

Rule 0.5 

A rule of table top gaming. If the DM/GM is being an Ass/dumbass/idiot and/or abusing rule 0, the players can choose to override him by leaving his game and starting their own.
An alternate version involves Smacking the DM over the head with the Dungeon Master's Guide.

DM: The ghoul rolled a 28 On his check to resist your Trip attempt.
Player: How the Hell does a ghoul get a 28?
Dm: With His +8 grapple modifier.
Player: But it is a Strength check, not a grapple!!
DM: I am the DM, Under Rule 0 I say He uses his Grapple Modifier.
This is where Rule 0.5 Is invoked
Every player at table: Smacks DM upside head with books and Leaves game.

Rule 0.5 by Eldrich Thurge January 30, 2009

rule 0 

This is an unspoken rule in Table top RPGs. It is that the Game Master, or whoever is running the campaign, can simply say no to anything the other players suggest without explanation.

Player: I want to make a half dragon werewolf wielding two greatswords.

GM: I'm invoking Rule 0. No.

rule 0 by korik1 November 22, 2007

rule 0 of the internet

Ask for none, and you shall recieve all.

In other words, if someone explicitly says they don't like something or don't want to see something, that's all they'll see for an extended period of time. Examples include the Harambe meme, Ligma, and Philip Defranco being called "daddy".

YouTube commenter 1: Here's 10 dollars for you, daddy

Philip Defranco: Thanks, but please don't call me "daddy".

*YouTube comments proceed to call him daddy for entire livestream and beyond*

Another commenter: Phil, you broke rule 0 of the internet. What have you done?

rule 0 of the internet by akuwardmoments August 21, 2019

Rule -0 

You cannot make up a Negative rule to counteract the meaning of it's absolute value.

Jimbob: I made a rule -1 so now I can talk about fight club.

Bobjoe: Rule -0.

Rule -0 by Tzaro January 8, 2010