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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
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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
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Witch Bath 

A bath consisting of a variety of slats, oils, soaps or any other added ingredients such as fruits, milks, herbs or any other spices for health or beautifying benifits.
She brought home alot of stuff and took it to the bathroom. She must be taking a witch bath.
Witch Bath by carnieboy30 October 26, 2020
Word of the Day on October 31, 2026

kinktober 

An excuse for people to write porn with different types of kinks throughout the month of October.

Smut Fanfiction
That chick doesn't write often but when she does, its for Kinktober.
kinktober by Kinkiest July 12, 2018
Word of the Day on October 30, 2026

proper lad 

a lad that is such a lad that he is a proper lad
person1:did you see bob
person2: ya he was a proper lad
Word of the Day on October 29, 2026
The number of years you are still sexually active
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
sexspan by Dr Kat April 21, 2022
Word of the Day on October 28, 2026
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