Earlier quoted context omitted.
Yes, one of the most annoying things you can encounter is a conversation at dinner with multiple Google employees. They will constantly mention that Google is working on something and then after confirmation with each other that it is still private, refuse to tell anymore details. It seems like it's encouraged in Google culture to brag but in a secretive manner to remind outsiders of what they are missing.
... or maybe they're really excited about whatever it is and want to talk about it, but also don't want to get fired for leaking something?
Plus, Google's huge and has very few internal communication barriers --- nearly everything is open to everyone. So it's really easy to get into the habit of casually talking about internal products when talking shop.
Then you notice someone nearby who isn't a Googler, and you go oh shit and stop talking.