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It needs moar Desu. No exceptions.
Example 1
Person A: Can i get a Meat Craver Pizza with extra Desu?
Person B: Lolwut?
Person A: Rule 50.

Example 2
Greetings! I came to your online community and i find your lack of Desu is disturbing. Please follow Rule 50.

Example 3
Desu Desu Desu Desu Desu Desu Desu Desu Desu Desu Desu Desu Desu Desu Desu Desu
Rule 50 by superfly98 February 9, 2009
No Akame.
Akame fan: i love akame
Liru fucker: bro you just broke rule 50
Rule 50 by the real liru fucker October 11, 2021
The rule of the internet (like Rule 34, Rule 63, etc.) which dictates that every fictional work will have a crossover with every other one at some point.
Person 1: Would it be funny if Sparklecare x JToH x Mega Man was a thing?
Person 2: Rule 50, man, rule 50.

The 50% Rule 

The 50% Rule

This rule is based on the 4 basic areas of interest to a man – (in no particular order) 1- FACE / 2-CHEST / 3-BUTT / 4- ATTITUDE. The 50% rule states that a woman only needs to possess favorable qualities in 50% of these basic areas of interest to be looked upon as desirable or lust worthy to a man. Basically stated 2 out of 4 are enough. Anything more is a bonus.
A woman with a nice rack and great attitude is just as desirable as a woman with a nice face and good butt. Mix & match using The 50% Rule, it works any way you try it.
The 50% Rule by gunslinger50 November 19, 2011

The 1.50 Rule 

A 1.50 is when a girl gives a male one dollar and fifty cents to let her suck him off and yes swallow. Otherwise known as Reverse Oral Prostitution. The rule is the definition
Damm she really gave you a good o'l 1.50

Remember The 1.50 Rule she pays you to suck you off

You 1.50 lover, you've been giving 1.50s to every Bob-Tod Jones in the county.

You'd give a 1.50 to everyone in school you slut

Rule of 50 

The average adult has a 50/50 chance of surviving a 50-yard swim or 50 minutes in 50-degree water.
Coast Guard rescuers must work fast due to the Rule of 50
Rule of 50 by Anonymouz+ April 6, 2010