Ogni morte di papa

Ogni morte di papa
Every death of a pope

This idiom is used to describe something that happens very rarely, almost never. It originates from the infrequency of a pope’s death, as popes tend to serve for long periods, often until their natural death, which can be decades apart.

Exemples:

1. Vado a trovare i miei nonni ogni morte di papa. – I visit my grandparents every death of a pope.
2. Mangiamo fuori ogni morte di papa. – We eat out every death of a pope.
3. Marco mi chiama solo ogni morte di papa. – Marco only calls me every death of a pope.