Used to mean the first day of a the woman's menstrual cycle. Can be metaphorical to the morning of December the 25th, because one awakens to view giant red packages under the tree, or bush.

Got the covid-19 vaccine

the act of dumping/ breaking up with a person while ejaculating on their face. It must be pre-planned for a quick getaway. The look on the receivers face should be akin to that of a child on Christmas morning.

surprise!

Its Christmas!

(but, instead of presents its cum and disappointment.)

That special time in a young man's life when its 7 o'clock in the morning on December 25th, and out of excitement he runs down the stairs at full speed, not expecting a sudden pain as his newly fallen balls flap against his thigh. This right of passage makes you think twice about running down the stairs next year.