I think I can provide some insight into some of the code words being used in the PizzaGate investigation.

Domino(es): In prison, inmates are sometimes forced to implant a domino inside of their penis. While this is very taboo in the outside world, it has become a norm for most prison culture. The reason this is done is to increase sexual performance, at least that’s what they believe. I don’t really know the science behind it, but I digress. A friend of mine told me and showed me his implant after a stay in a Texas State Prison. He said “it’s a way to discern between someone being a ‘bitch’(meaning you take it up the ass) and someone being dominate”. Playing dominoes is code for sexual intercourse when you are the dominate-domino implanted..

http://www.vice.com/read/pen-pals-dont-stick-dominos-in-your-dick

NOTE: I am not saying that this is literally what they mean in the code, just that it may point us in the right direction