extremely rare occurrence; once-in-a-blue-moon event
Buddhist-derived yojijukugo literally meaning 'a blind turtle and a floating log'; used to describe an event so unlikely it is almost miraculous. Often appears in the fuller phrase 盲亀の浮木.
See also: 盲亀の浮木
This coincidence is truly a once-in-a-blue-moon event.
The term 'moki-fuboku' originates from a Buddhist parable.
The fuller phrase with the same meaning; 盲亀浮木 is a four-character abbreviation.
A yojijukugo abbreviation of the Buddhist parable 盲亀の浮木, which describes a blind turtle surfacing once every hundred years and encountering a floating log with a hole, illustrating the extreme rarity of encountering the Dharma.