A rule stating that any swear word or phrase can and should be be replaced with DragonBall Z characters, when in the presence of siblings.
1: My printer just died!!!!1!1111!!!1!! NAMEK!

2: What?

1: Little sis is in the room, rule 51.
by Mottman August 22, 2010

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Top Definition
There will always be more rules. Always.
Dude 1>Dude, i just finished learning all the Internet rules.

Dude 2> Rule 51
by DoomB January 14, 2011

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The Urban Dictionary T-Shirt

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Sometimes, you're wrong.

"Rule Fifty-One" was the title of the 7th season finale of the TV show "NCIS," referring to Special Agent Gibbs' established 50 rules for being a special agent of the Naval Criminal Investigative Service. At the end of the episode, in which he needed a lawyer, he went through a box with pieces of paper on which he'd written his rules, and one said, "#13 NEVER, EVER INVOLVE A LAWYER." He turned it over and wrote, "#51 SOMETIMES YOU'RE WRONG." A major admission for Gibbs, even to himself. If he can admit it, we all can.
DiNozzo: "Well, Ziva, it's like Ben Affleck said in 'The Hunt for Red October'... "

McGee: "Tony, Affleck didn't start playing Jack Ryan until 'The Sum of All Fears.' Alec Baldwin played Ryan in 'Red October.'"

DiNozzo: "Seriously, McGeek? YOU are challenging ME on a movie reference? I'm always right about these things, especially when Sean Connery is in the movie!"

Gibbs (slapping DiNozzo on the back of the head): "Rule 51."

DiNozzo: "Ow! Oh yeah: 'Sometimes, you're wrong.'"
by UncleMikeNJ July 07, 2011

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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An internet rule which states: For every act of nature or man there will be someone within a short period of time that will attribute that act to a conspiracy theory.

Terrorists kill someone? False Flag! Clouds look weird? Conspiracy to poison us all! Another school shooting? Never happened! Just a conspiracy to take our guns! Government says it is a weather balloon? Alien cover-up!

Corollary: If you can think of it, there's a conspiracy theory about it somewhere online.
Do you think Bowie is really dead?
Rule 51!
by Theogenes July 04, 2016

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt