What is Sidetalk?
1.
Quiet conversation that takes place between people who are sitting beside each other during some kind of committee meeting or official gathering. When enough goes on, and as sound grows exponentially, it can be loud enough to distract the chairperson or whoever is speaking, as well as annoy those who want to carry the meeting's agenda forward.
During the meeting, the mayor became so frustrated with all the sidetalk going on between the city councillors, she finally yelled, "Can you all pay attention to what I'm saying for just a second?!?"
See