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The HAC Rule primarily applies to Friends With Benefits (FWB's), occasional hook-ups (OHU's), and one night stands. It protects all parties involved from given consequences of the following actions:

Hickeys
Anal
Choking

Any party that violates the HAC Rule is subject to the potential suspension of their FWB or OHU status, or the potential for the One Night Stand to become one of the former status'.
Beth: Ok Mike...I'm really drunk, but that doesn't mean the HAC Rule isn't in effect. I have a work meeting tomorrow and can't have any marks left on me.

Mike: Of course...but does the HAC Rule really need to be in full effect?!?! Shouldn't it just be the H & C...I mean, you're not planning on showing your ass, are you??

Beth: Does that mean you want to be exclsive?

Mike: Uh...ok...HAC Rule is in effect.
HAC Rule by UptownTrain May 3, 2011
Related Words
Rule 34 Rule Rule 35 rule 1 RULE #1 rule 2 ruler Rule 11 rule 43 rule 69

Bernie Rule 

Similar to the game, the Bernie Rule is invoked when someone yells out "Bernie!" At that point, all those who know the Bernie Rule must Move it Like Bernie for the next five seconds.

Those who don't know the rule and ask what happened must be informed, and are from that point susceptible to the Bernie Rule.

One person is allowed three (3) Bernie Calls per day.
I was in class when the Bernie Rule was invoked! Ten students and the professor Bernied, and the rest of the class knows the rule now too!

gimlican rule 

the rule that any 1 entity is considered as one person or objective, mainly in contests to kill large numbers.

no matter the size, strenght or condition, it still "counts as one."
the battle for minas tirith:

*legolas just took down a huge Eliphaunt with 3 arrows straight to the head*

gimly: That still counts as one!

this is known as the Gimlican Rule of Kill Measurement.
gimlican rule by semois November 10, 2011

Shenanigans rule 

The shenanigans rule states that at any time during the first five minutes of a first online/Tinder date, either party may call "shenanigans!" at which point, both parties proceed to pound their drinks and leave with no hard feelings. The intention of the shenanigans rule is to save everybody time in those awkward situations where it is just never going to happen...
Hey, it was really great to meet you, and this pop-up cider bar is amazing, but I'm gonna go ahead and use the shenanigans rule to save us both some time here...
Shenanigans rule by kanaat79 October 21, 2015

Golden rule 

When you see a Eugene reach in his backpack itscha time to run
When a Eugene reaches into his backpack I follow the golden rule
Golden rule by Mr poopybutthole November 29, 2017

vulture rule 

To apply the vulture rule means to raid a base in the game Star Trek Fleet Command of one of your own alliance players or from a friendly alliance player. Who is unable to come to the game (Real Life permissions/ shield = share) and will lose the resources nevertheless by enemies.

This rule is applied many times by the alliance VHL of Server 146 (former FEF) and found its origin through the playstyle of NightSlammer.
Ok boys, we can not reach him through discord nor any pings ingame work. We will kick him and vulture rule will be in effect. Enjoy the feast!
vulture rule by NightSlammer August 20, 2021