Some random shit I defined it as: What you say if you didn't want to hear something or see something as if to "ex" or slash or erase it from one's memory.
(n.) A former boyfriend or girlfriend.
(n.) A former anything.
*see picture of naked grandma* EX!!
Nadia: I love you, but I think we should spend sometime apart for a change.
Genghis Khan was an ex-ruler of Mongolia and much of Asia.