Borthday, the opposite of a birthday. Also known as An Un-birthday a borthday occurs for everyone 364 times a year, the only exception being their birthday
"Hey Max, Happy Borthday!"
"Whoa, Dood you remembered, oh, and by the way, happy borthday!"
"No Max, Its my Birthday today, how could you forget D:"
When the time on the clock matches your birthday.
If you were born on December 26th, your two borthdays are at 12:26 am and 12:26 pm.