That's what my mother used to say when things got a little crowded and hectic around the house. She usually said it when we were all tromping through the kitchen as she was trying to cook supper. Never mind that she'd never been to Grand Central Station. Or New York City.
Grand Central Station was (and is, I suppose) the epitome of hustle-bustle to-and-fro-ness. It's my terminus every morning into work and my point of departure each afternoon. It is very hustly-bustly, that I can vouch. But it is a simply fabulous place to be a part of every day. What an incredible history (click on link above, if interested)! Thanks, Jackie O for helping to save it from the wrecking ball back in the 1970s.
So even though Mother never set foot in GCS, she knew what she was talking about. Why, it's just like Grand Central Station in there!