The original Japanese wordplay, which I've elided somewhat in the translation, centers around the sound ほと hoto. It's part of the modern words ほとほとに hotohoto ni, used here in the title and meaning "completely" or "totally", and ほととぎす hototogisu, the Japanese name for the lesser cuckoo. However, hoto by itself is also an archaic term for the female genitals.