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An ex who has become a friend, well, almost a friend; (otherwise you would just say: friend).

(Alternate spelling: fr-ex).
Jane went out for a lovely dinner with her latest frex, Joe. She felt that of all her frexes, he was the most comfortable with the transition. Unfortunately, her new BF, Jake, wasn't.
by EmBees June 08, 2007
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3
v. to have meaningless sex with a friend, usually takes place in college.

"During our study break, John and I had frex."

"You and John? BUT I THOUGHT YOU TWO WERE FRIENDS!"

"I know...therefore, we had frex. Duh."
by JOH-EJ April 23, 2009
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4
An Ex who you're still friends with (friend + ex)

You do NOT hookup, that's a Sexfrex
"We're not getting back together- he's just my frex"

"I got really grunk last night and my frex turned into my sexfrex... whoops"
by OSUgirls February 23, 2014
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5
Supplement for Fuck or Frick
Frexmas also means Christmas
Frex also means your friend who used to be your ex.
1. Frex you

2. MERRY FREXMAS Y'ALL!
3. She's my Frex
by Bitesh9 December 12, 2018
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6
-An ex-friend.

-Describes someone who used to be your friend, but who you can no longer label as such.

I have a frex who once stole my English homework and passed it as her own.

by scruffedup April 02, 2009
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7
Free sex. Free of charge, free of commitment, free of emotion. Similar to "friends with benefits", but without the friend part.
"I met this girl at school, and before we had the chance to talk much, we had frex. I don't plan on becoming friends with her..."
by AMBER REX December 14, 2005
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