Orion proxima

a flow of blood and other material from the lining of the uterus, occurring in non-pregnant women at intervals of about 28 days between puberty and the menopause and typically lasting for a few days.

"Orion Proxima pops up once in a month and is so fucking annoying"
"I wish Orion Proxima didn't exist"
"I have to buy so many tampons so Orion Proxima can stop"
"Orion Proxima might suddenly come up to small girls between ages 11-13 and start causing them pain"