I believe it defines how well your own players will resist fakes by the opponents. 100 being the best...
I could be wrong though, so unless someone else is 100%, I suggest you maybe start a game with it set to 100, see how your players react towards fakes, and then play a game with it set to 0, and see how it differs.
By the way, next time, edit your posts rather than making 6 consecutive ones
The reason it becomes a beer is because the forum uses smilies, and the text for a beer is ( b ).
You can disable smilieys when making a post by checking the Disable Smilies in this post