Here's your hat, what's your hurry?

Here's you hat, what's your hurry? is something my grandma says to me a lot. She always says it to me as a joke whenever I'd be leaving her house. She said she started saying it because her father would always say it to people at their home. Her father was a very sarcastic person, she said. When I first asked her what it meant, she wouldn't really tell  me because it isn't the most polite thing to say to someone, and it's a bit snarky. It's all in good fun, though.