What does fish and visitors stink in 3 days mean?

The phrase "fish and visitors stink in three days" suggests that both fish and guests can become unpleasant after a short period. It implies that, just as fish can go bad quickly, visitors may overstay their welcome or become bothersome if they linger too long. Overall, it conveys the idea that freshness and enjoyment can diminish with time, whether it’s food or company.