the end of sex in a relationship or the relationship altogether
I'm pretty sure he's cheating on her, that relationship definitely has a sexpiration date.
by Craig January 18, 2005
Sexpiration is a date when an older and formally very sensual women all of a sudden loses her sexual appetite and libido and prefers to play with the grandchildren rather than you or herself.
You'll know sexpiration when you experience it but not before.
by Grandpa Roy March 21, 2014