What does Jeremiah 19:11 mean?

Tell them, 'This is what the Lord of Armies says: I'll smash this people and this city like someone smashes a clay jar that can't be fixed. They'll bury the dead in Topheth until there's no room left.' Jeremiah 19:11 - Modern Text Bible

(God will destroy the people and city so completely that there's no way to repair the damage.)