Rule of thumb

An approximate way of doing something based on presumptions rather than fact. Contrary to popular belief, the idea the law once allowed a husband to beat his wife as long as the device was no thicker than his thumb is false, as such assaults were outlawed for centuries in common law, although the ban wasn't generally codified in written law until the 1980s.

A driver kept going 5 mph over the speed limit, thinking the police had a rule of thumb that it was a waste of time to give out a ticket to anyone going anything lower than that.

by BlastFurnace February 27, 2025

Rule 500

If something has Diavolo from the fifth part of jojo dying in it, its canon

Guy 1: Hey did you see Diavolo dying in the background?
Guy 2: Yeah, this shits canon now because of rule 500

by imp fuck2 January 12, 2021

Prison rules

The philosophy that if you don’t fight, people will just keep fucking with you; An environment, such as a school or work place, where there is little to no supervision, rules aren’t regularly enforced, and/or the only way you get people to leave you alone is by standing up for yourself.

Around here, it’s prison rules.

by SiL3Nt J September 13, 2023

5 year rule

A rule that says a couple should not have kids within the first 5 years of their relationship or marriage.

Damien: I love our kids, but they are too much trouble

Tasha: I know, it's hard work

Damien: We should've followed the 5 year rule, and not have them very early in our marriage

Tasha: Agreed

by chanceplan314 October 11, 2024

The Rule of Thumb

The teenage act of using your thumb as a hole guide for your cock which is larger than she is used to. After slapping your fumbling dick in your palm, you gently insert your thumb into her pussy. Like Houdini you simply run your cock along your thumb, using it like a ruler or a guide, to direct and allow an easy and simple access’s to an otherwise unsatisfied pussy.

She was too tight for me, it was dark and I couldn’t even find her hole
properly. I heard Jimmy strolled in last night at the pub and after a few drinks he took her home. Apparently he used “the rule of thumb” his old
Man taught him. After a while the crafty fucker worked his huge knob to the hilt - and we didn’t see him for 3 days!

by Jungle Diver August 1, 2019

Rule of the thing

A fun idiom that means "a broadly accurate guide or principle, based on practice rather than theory." It is exactly like "Rule of Thumb" but without the added joke that it's meaning stems from domestic abuse.

The general rule of the thing is to add the ingredients when the water starts to boil

by Heylin September 14, 2019

Rule infinity

If there is a number that has no rule you have to make a rule for it

22222222222 has no Rule, now i have to make because of Rule infinity

by Liriliththeboy September 19, 2020