to say something in a manner as to get someone to engage you in coversation or to listen to what you want to say.
what lonely people do
Person 1: today has been such a horrible day.(the converbait)
Person 2: Oh really? Why?
Person 1: Oh, well blah blah blah
Person 1: have you ever heard of...(this is the converbait)
Person 2: no
Person 1: oh its awesome, let me tell you about it