I’m going with CIP (that’s “crying in private”).

There are a couple things I’d red-pen on this sign if I were asked to do so, including the random insertion of double exclamation points in what is supposed to be a professional advertisement.

But double exclamation points and a tilde? Is this some hip new thing the youngsters are doing?

My thanks to Scott, whose MARTA ennui is probably worse than mine.