It's absolutely chucking it down.

Meaning

It's raining very heavily.

Examples

• John: I'm going to be late.
• Alice: What's the matter?
• John: <b>It's absolutely chucking it down</b>, and traffic is terrible.
• Alice: Oh dear. I hope you get there safely. Stay dry! <b>It's absolutely chucking it down</b> here too!