elevator talk

Meaningless conversation, idle chat, pretentious senseless babble, gossip.

e.g.

Dave: " I plan on marrying this summer."
Mark: "STFU ! What did u propose on the elevator? That's elevator talk"

Jane: "What the heck is up with Travis? He's delusional lately."
Chelsea: "That's elevator talk you know you really don't speak like that Jane!"