The idiom 'Thick and Fast' is mostly used in informal contexts to mean that things are coming at you very quickly and in great numbers. Another expression which has the same meaning is ‘fast and furious'.
The meaning of both 'thick' and ‘fast' in Old English meant ‘close together'. The idiom suggests that things are coming at you so quickly that they seem to be joined or ‘fastened' to each other. Since the flow is uninterrupted, you get little or no time to react.
1. During the press conference, the questions from reporters of various TV channels came thick and fast.
2. On the last day of proposal submission, the documents came thick and fast to the editors.
3. After the launch of new policy, the questions came thick and fast from the employees.