table-talk

/T EY1 B AH0 L T AO1 K/
noun
  1. 1

    Conversation, especially of an informal or somewhat gossipy nature, among a group seated together for a meal or other social activity.

  2. 2

    (games) Conversation that illicitly conveys information or suggestions to another player.

Source: https://en.wiktionary.org/wiki/table%20talk, https://en.wiktionary.org/wiki/table-talk