1.for men,
guard your balls. Something all guys should know and observe in ANY situation.
2.for women,
guard your boobs.
who knows the first rule of hacky sack?
-let's teach him the first rule of the office.
by yo mama tamer November 3, 2008
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the first/number one rule of K-pop:

Don't fall in love with an idol.
I just started stanning The Boyz and I broke the first rule of kpop
by •o• June 14, 2021
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This rule states that anyone who sees an object or person first before any other party sees it has the right to that object. This overrules all dibs or other forms of object possession rules.
John: Dude!! Did you see that hot chick last night? I got her number and we're totally gonna hook up.

Ryan: I saw her first dude! You can't do that. I call saw it first rule

John: Woah, sorry Bro.I didn't know, she's all yours
by SaskiaD August 6, 2014
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First Rule of Fight Club, don't talk about Fight Club.
Fight Club is something you never talk about. Why? Because it is the first rule of Fight Club.
by Oz101010101001010 November 29, 2008
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“No one wants to hear about your troubles unless your troubles are worse than theirs.
When a University of Chicago law professor blogged his complaints about making ends meet with a household income of more than a quarter of a million dollars a year, he violated the First Rule of Self Pity.
by MrJM September 25, 2010
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A rule first postulated by known film director George Lucas, stating that, "In any given movie franchise, at least one third of the films will suck." In addition to his own Star Wars prequels, some examples of movie sagas that follow this rule are: the Matrix saga, The Godfather trilogy, The Planet of the Apes, Shrek.

An exception to the rule is Toy Story, while the ultimate application of the rule is the Twilight Saga, wherein all the movies suck, the novels sucked, and yet there's another movie in the making.
Son: Dad, do you want to watch the Phantom Menace?
John: There were no prequels, and I have no son.

Paul: Should we watch Godfather Part II?
Sam: Does George Lucas's first rule of cinematography apply to it?
Paul: On the contrary, it's the best in the series!
by Patiodude October 27, 2011
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