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Never knowingly be serious. A rule created by the Doctor in the popular BBC series Doctor Who during the series 6 episode "Let's Kill Hitler".
(The Doctor comes out wearing a tux and a top hat.)

River: You're dying! And you stopped to change?

The Doctor: Oh, you should always waste time when you don't have any. Time is not the boss of you. Rule 408. Amelia Pond. Judgment Death machine. Why am I not surprised? Sonic cane.

River: Are you serious?

The Doctor: Never knowingly. Never knowingly be serious. Rule 27. You might want to write these down.
Rule 27 by Sophia42 November 14, 2011
Words you can keep
If a rule cannot be explained in a minimum of 6 lines, it can no longer be clarified as a rule.
Rule 303

Rule 303 made famous by Harry "Breaker" Morant and Englishman living in Australia at the start of the 20th century who enlisted in the Australian Armed Forces to help the British fight a war with the Boer's in South Africa.

Random guy "Rule 27 gtfo"
rule 27 by Recycle Bin123 February 16, 2009
Related Words
If music is playing, you must dance
1: Here's the fight song
2: Come on, we've gotta dance
1: What? Why?
2: Rule 27
Rule 27 by Johnny Postit March 30, 2009

27 minute rule 

You can take up to 27 minutes to pee after sex to avoid a yeast infection/other infectious things.
Dude, 27 minute rule it will still works.
27 minute rule by tittiesbebanging February 13, 2010
Josh's and Trinitys have to fuck.

No exeptions.
Trinity: what's your name
Josh: josh.
Trinity: rule 274. Fuck me.
rule 274 by Sonicwave.exe May 17, 2021

Rule 2763 

If it exists, there's an object show character or a objectified show of it. >:3 (BEEFYDIE REFERENCE???)
Rule 2763 is not a real internet rule btw. May be used as a joke or whatever.
Rule 2763 by CedarFeline March 9, 2025
More from Urban Dictionary

Salad Days 

green inexperienced youthful judgement and cold blooded execution of those judgements.

Rashness with little concern of consequence.

Antony and Cleopatra. William Shakespeare

"My salad days,
When I was green in judgment, cold in blood."

- William Shakespeare, Antony and Cleopatra, 1.5
"How did you end up in jail?"

"Salad days, 'nuf said."
Salad Days by GilbyRFC0 October 7, 2011
Word of the Day on August 28, 2026

age gate 

An absolutely foolproof way to keep minors from viewing content deemed "too mature" for them to watch.
Billy: "So I was trying to watch some videos for an M rated game, and I ran into an age gate, so I put in my real birthday. SOMEHOW it managed to figure out that I am 12. CURSE YOU AGE GATE!!!"

Bill: "Fucking age gate! *quick scroll* THERE! I was born on January 1, 1904. Fuck you age gate."
age gate by Banja January 7, 2011
Word of the Day on August 27, 2026

board chow 

A)
The Crud that collects under the keys in a keyboard. Usually more severe in the keyboards of programmers and webmasters as they tend to spend a lot of time at the the computer and thus eat at their desk. Mainly affecting IBM Model M (clicly) style boards.

B)
Can also be used to gross out Non-Techie people
A)
Bill: want to go to the club?
Bob: No, I've got to clean out my board chow, keys are starting to stick.

B)
Bill: Want to go out to get a bite?
Bob: No, i am just going to have some of my board chow/
Bill: Whats' that?
Bob: The food scraps that collect in my keyboard; Want some?
Bill: *GAG* *HURL* *GAG*
board chow by BinaryHackerMan September 3, 2007
Word of the Day on August 26, 2026

young pup 

a young person, a young adult in their late teens/early 20s.
Ah, you're just a young pup at 23!
young pup by the dog May 30, 2006
Word of the Day on August 25, 2026
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