The Cardinal Rule a substantial rule that is in place in a certain situation or organization. And it must not be broken at anytime.
'You must never date your friends ex. thats the cardinal rule of friendship'

'You broke the cardinal rule didn't you? Spies don't fall in love' - NBC's Chuck

'Never date a co-worker, its the cardinal rule. because when it all blows up in your face. your screwed'
by Keyls April 6, 2010
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An unwritten rule, that is collectively known and abided by society as a whole.
"If one gest jumped by the Bra Boys in Maroubra's Last Goon Party, and you quickly realize that there is more than one guy, one can exclaim the cardinal rule '1-V-1', meaning the gang must give you a fighting chance, taking you on one at a time."
by bigberg June 10, 2014
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In regards to friendship, the cardinal rule is never dating your friend's ex-boyfriend. When a close friend and their hunny break up, being a friend means you dont try to date, mack, get with, or hook up with the ex. Breaking this rule defiles friendship and ruins bonds and all friendly love with the rule breaker in the circle of friends.
After Max broke up with Sid, Alexis, a 'friend' of Sid, broke the cardinal rule and started dating Max less than a week after the break up. Sid and Alexis' friendship was ruined and Sid soon learned that no one gave two squirts of piss about her emotions, regardless or what was said.
by Sidoese February 5, 2009
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Don't fuck with the people that handle your food.
That bitch forgot the cardinal rule so I gave her some dick cheese for that salad.
by Waiting101 February 7, 2017
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You never fuck with the people that handle your food.
If you break the cardinal rule at any resturaunt they will do the things that they did in the movie Waiting...
by Trumplover2024 January 5, 2020
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Also known as the Cardinal Rule of Food; mentioned in the 2005 comedy “Waiting.” The Cardinal Rule is: never fuck with the person who is handling your food. Technically it’s illegal in reality because it is food tampering, however, sometimes people who work food service wish to get revenge like this on nasty Karen’s.
(A typical dinner rush at Applebee’s)
Garrett (handing food back to the kitchen staff): “We got our first Karen of the night. She ordered her steak as well-done and apparently it’s medium-well. She just broke the Cardinal Rule.”
Jeff: “She’s definitely going to get a secret ingredient along with other extra care done to her food since she’s a complete bitch!” (Reaches into his pants and yanks out a pubic hair to hide in the broccoli, then spits into the mashed potatoes, and finishes off with shaking dandruff onto the steak)
(Garrett takes the plate back while trying not to laugh)
by rosenovarocks August 17, 2021
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