Most of River Song
's "The Doctor lies" is about it being her own rule #1 for figuring out what's going on when things don't seem to make sense. If things seem incomplete or impossible, consider first if The Doctor lied about something.
Rory Williams: Why did he tell us he was dead?
River Song: Rule One: The Doctor lies. So do I.
The Doctor lies. (from Doctor Who)
Amy: But he (the Doctor) was dead.
River: Who told you that?
Amy: He did.
River: Rule one: the Doctor lies.
River: He said no one could save him. But he must have known I could.
The Doctor: Rule one: the Doctor lies.
River: Okay. I'm going to tell you what I probably shouldn't. The Doctor's last secret. Don't you want to know what he whispered in my ear?
Amy: He whispered his name.
River: Not his name, no.
Amy: Yeah it was. He said it was.
River: Rule one?
Amy: The Doctor lies.
Literal translation is 'don't be a pussy'. Most often used when berating someone with 'you forgot rule one' implying that if one has forgotten rule one then they're indeed a pussy.
Dan: I'm a little tired, my boots are chaffing and the wind is blowing in the wrong direction.
Gora: You're in violation of rule one. Get over that kicker.
A rule that states anything that results in any form of labor or risk should not be taken unless the amount of money your offered is to your liking
Only fight when you have been paid to do so
Never take a Favor...you get no money out of it
Everything....and everyone has a price....
This is Rule one