Conversation that is funny and not serious. (Cambridge Dictionary)
To speak to or address in a witty and teasing manner. (Merriam – Webster)
The playful and friendly exchange of teasing remarks. (Oxford Dictionaries)
Exchange remarks in a good-humoured teasing way. (Oxford Dictionaries)
An exchange of light, playful, teasing remarks; good-natured raillery. (Dictionary.com)
Why It’s So Important to Banter With Young Children.
Beer & Banter.