1 definition by Mirror on the wall

Typically a girl who says she'll always be there but will leave when the relationship gets hard.

She will think she is always right. A true fuck girl will throw your past and flaws in your face to make her look good. She will not see you for you now and believe what others say. But a true fuck girl will find a new man fast because typically beautiful and will flaunt him to get a reaction. A girl like this won't ask for anything from a anyone just to keep her with a clean record to throw back at you later. It's hard to spot these girls But if you are feeling unwanted and she shows no effort of change is a good sign. Along with calling mostly every male a fuckboy.
FuckGirl with new bf to ex: "Now that I've seen a big penis you are just tiny"

"well I never asked you to.."
"Look at him.. Him... Him... What a fuckboy!"
Defined fuck girl
by Mirror on the wall March 6, 2015
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