Generally a double entendre, mostly in reference to blood, in another view it can be used as an expression of finality. In this case the "urban" definition of Period is used to express the finality of ones life especially when it's accompanied by blood.
John F. Kennedy got his period on 05/29/1917.
The unfathomable demonic void of perpetual agony I, along other cis females, sometimes get.
Period is hell.
Saying the word “period” not only means you get no bitches but it also refers to the definition of lesbian.
“Omg becky it’s giving baddieee perioddd”
Something no male should ever know about. Its a woman secret.
"It's okay, I'm on my period." She said to her disgruntled male friend.