One of your previous significant others whom you've had a relation-shit, and coincidentally, a break up with.
In most cases, not someone you ever want to see again.
In very VERY rare cases, someone you might still talk to and consider a friend, because you both have a history and too many experiences to forget about together and are both mature enough to push any emotions you have left (if any), aside.
To sum it up nicely, ex is a word used by thousands of people around the world as a cover up for the words obnoxiouss, evil, and slutty.
Got a ex wife or hubby who you love to hate? This is the perfect ex patch for you! Sew this patch onto your jacket, vest, purse, wallet, whatever you please.
DO NOT heat press on to leather.
