The Weasley twins told Harry that the password to the map was: "I solemnly swear that I am up to no good". But how could THEY have known it? It's not exactly LOTR's Moria door with "12345" level of security—you do not have a plaintext password hint (or any).
Answer
JKR answered this in one of the interviews. AFAIR, the process in her mind was, quite surprisingly, not unlike real life hacking (you probe and poke around and change the attack based on system feedback to your trial-and-error attempts).
From "MuggleNet and The Leaky Cauldron interview Joanne Kathleen Rowling"
July 16, 2005: Harry Potter and the Half-Blood Prince publication day Edinburgh, Scotland - Part Three.
MA: How did they figure out how to work the map?
JKR: Don't you - well. This is how I explained it to myself at the time, and this does sound glib. Don't you think it would be quite a Fred and Georgeish thing to say in jest, and then see this thing transform?
MA: Yeah.
JKR: Can't you just see them?
ES: But the exact word combination? Is that just a lot of luck, or Felix Felicis -
JKR: Or, the map helped.
MA: Yep, yeah. You can see them sort of answering and joking with each other -
JKR: And the map flickering into life here and there when they got closer and closer, and finally they hit upon the exact right word combination and it just erupts.
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