How roleplay the use of bluff skill - delivering a secret message?

[Jon_Dahl]

Delivering a Secret Message

You can use Bluff to get a message across to another character without others understanding it. The DC is 15 for simple messages, or 20 for complex messages, especially those that rely on getting across new information. Failure by 4 or less means you can’t get the message across. Failure by 5 or more means that some false information has been implied or inferred. Anyone listening to the exchange can make a Sense Motive check opposed by the Bluff check you made to transmit in order to intercept your message (see Sense Motive).

I'm the game that I'm running a certain NPC will hint that one of the referees in a gladiator tournament is (easily) bribable. This is a DC 15 Bluff check.

I find roleplaying this really hard so I was thinking about this:
"Your friend suddenly talks all kinds nonsense about weather and her cat and how she wishes that she had more money." Then Sense Motive rolls. Those who roll 15 will understand the true message. Those who roll 11 to 14 understand nothing more than what she's saying. Those who roll 10 or less understand that you can't bribe any of the referees.

But I'd like to hear how would you do this.

 

[Sekhmet]

Your official says, "I would never accept a bribe".
Using the Bluff skill, his tone goes from stern and dour to sarcastic, veiled, or humorous.
He extends his hand in a "pay me" gesture as he says "bribe".

Some people get that the tone or gesture mean he is just lying, some people accept his word or gesture as signaling he is open to a bribe, some people give him a handshake and say "good for you".

 

[Quickleaf]

Maybe something like: "It's amazing how well Gladiator School X has done these last few years isn't it? It certainly helped that the school leader was one of the wealthiest men in the city, from one of the oldest most respectable lineages. Far be it from me to suggest he bought his way to wealth however. Now, NPC X (the referree) - there's a man who has been around almost as long as the school leader of Gladiator School X. Why, he might even remember when Gladiator School X was just beginning." The informant NPC raises brow with a wry smile.

If the PCs are paying the informant NPC for the information, have the NPC informant draw a wry parallel between him/herself and the NPC X.

Player who get it, well, they get it. Also, anyone can ask to roll a Sense Motive if they suspect there's a hidden message.

 

[The_King_in_Yellow]

That passage under the bluff skill generally relates to thieves cant, I mention this if you wasn't already aware. http://www.pascalbonenfant.com/18c/cant/