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1.
A person who you were once friends with, but are no longer friends with, usually due to some kind of an argument.
Jana: "I was friends with Kathryn, until she stole my boyfriend."
Amanda: "Damn, Kathryn isn't a good friend then."
Jana: "She's not my friend anymore, she's my ex-friend."
by jj1110 September 25, 2011
 
2.
A person who you used to be friends with, but are no longer friends with, usually due to a fight.
"I was friends with Callie, but after she said all of that shit to Trent, and backstabbed me, we are no longer friends. She is my ex-friend.
by yushouldknowme June 09, 2011
 
3.
A person who you were friends with through an Ex and though they might be cool people you can't hang out with them anymore.
When Maria and I broke up I had to stop hanging out with her best friend Jane because we had become ex-friends.
by Wheresthepineapple September 07, 2010