The three simple rules Valves' art staff used for creating the box art of the game Left4Dead.
The Rules of Thumb are:

1) There should be a hand in it somehow

2) The hand should have a thumb bitten off, so customers would look at the four fingers remaining on the hand and think, "Hey, four."

3) Under no circumstances would they use Photoshop. L4D is a visceral experience, and its box art deserved the same approach.
by hunterVSsmoker July 27, 2009
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Originating from the Middle East, this refers to a father trying to penetrate his daughter with his thumb in order to assess whether she is ready to be married off. If penetration is impossible then she is not ready for marriage.
As a rule of thumb, Samira thought her father was somewhat unpredictable.
by Achmed1977 April 24, 2009
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The new rule of thumb is the publicly sanctioned male violence against women that do not comply with the current ideology. The Biden administration has exacerbated this by claiming attacks on certain groups.
Swimmer Riley Gaines just got assaulted by a male for speaking up about women’s rights. This day and age, the new rule of thumb allows males to beat women for speaking.
by Le11223344 April 7, 2023
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The new rule of thumb is the publicly sanctioned male violence against women that do not comply with the current ideology. The Biden administration has exacerbated this by claiming attacks on certain groups.
Swimmer Riley Gaines just got assaulted by a male for speaking up about women’s rights. This day and age, the new rule of thumb allows women to be savagely beaten by males for speaking up.
by April 7, 2023
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This is the Rule of Thumb invented on the VN Guineve DAOC message board.

Falcar's Rule States: You may date any age person ranging between 18 to Minus 5 years your Mother/Fathers age.
Bob: I like this chick, should I date her? She is a bit older than me. I mean, like in Cougar territory.

John: Well.. Falcar's Rule of Thumb man..

Bob: She is 6 years younger than my Mom, and I am 22.

John: You are Golden man.. Tag it.
by VN Person December 4, 2009
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1.Using "he" in a sentence as the default pronoun(instead of "he or she") for someone of an unknown gender,a person using this rule is thus considered a sexist by feminists.
2. Rule that compares such a person previously described to that of a wife-beater(wife beating is where the Rule of Thumb part originates).
My feminist English teacher yelled at me about my use of the Grammatical Rule of Thumb in my English paper.
by Klausmetzger February 9, 2008
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It is acceptable for a woman may hit her abusive husband with a skillet or frying pan with a base thickness equal or less than that of her thumb.

This rule was created in response to the idea that suggests social allowance for a man to hit his wife with a switch of thickness no greater than that of his thumb.
"When he came to, he realized he couldn't be mad as she had not broken the rule of thumb (for women)"
by Fostered Bananas November 13, 2011
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