Spanish (Castilian) · B2 weather

Llover sobre mojado

Literally: "To rain on wet ground"

Misfortunes piling up / same old story

Example

Perdí mis llaves y ahora se me ha roto el coche; realmente llueve sobre mojado.

I lost my keys and now my car has broken down; it really is one misfortune after another.

Pip says

When it already rained, more rain just makes puddles! Use this when bad things keep happening one after the other.

What does this phrase mean?