This mouthful of a term is a combination of three celestial events:
"A supermoon is when the moon becomes full on the same day it is closest to the Earth, thus making it look bigger and brighter.
A blue moon is the second full moon of a calendar month, which is a rarity since the moon completes its orbit around the Earth in 29.5 days.
Finally, a blood moon is the other name for a total lunar eclipse, which results in a reddish tinge the full moon takes on when it is fully eclipsed."
Here are some shots from the unusual night sky event