Table talk is a term used to refer to partners giving clues about their hands through comments they say across the card table. For the most part, these are passing comments that are not necessarily meant to give away their hand, but by deduction, a partner can gain information. This might be something like asking if a certain card has been played, or commenting that you did not play a certain color last time it was played. Basically, it is a form of cheating that for the most part is not intentional.