But what do they say in Osaka?

From the wikipedia article about ochazuke:

In Kyoto, ochazuke is known as bubuzuke. When a Kyoto native asks if a guest wants to eat bubuzuke, it really means that the person has overstayed and is being politely asked to leave.

But I like ochazuke! And I probably would've accepted the offer. Dammit. Glad I don't have to worry about that ever again.