Noun: Idle, but animated chat--could be directed to one who is not interested or could be catching up between acquaintances, akin to shooting the s--t, but of shorter duration.
Verb: To engage in such chat (like birds flap their wings and vocalize when getting together)
She came at me with some inane flap, and it was all I could do to act polite.
After looking at manky things on your computer, you get up and jump about whilst flapping your hands by your side. While your neighbours watch you in a confuzzled way.
Blondie - Omg the guy across the road from me is flapping! Only twatty people like him would flap.