I was described as a “fuck girl” by one of my guy friends. What does it mean to be a “fuck girl”?

[MrOracle]

It's a girl you have casual sex with, but not one you get into a relationship with.

Generally, this implies that you don't have much in the way of boundaries, so guys aren't going to be willing to trust you for something serious like a relationship, where their feelings, and potentially even their freedom, is on the line. If you don't have boundaries, they can't trust you not to cheat, or not to lie, or do whatever in order to get what you want or to justify something you did.

They're happy to have sex with you and have a casual relationship with you but they don't trust you enough to risk anything more.

Now, obviously, I don't know you, and I don't know if any of this actually applies to you or not, or if this term was correctly applied to you, or whatever. I'm just explaining what it (likely) means to him.

[JPrez]

To avoid a bad choice of words, you like to sleep around with guys a lot.

[DCooper]

It means you're hopping around that carousel... one horse after another !

[MannMitAntworten]

Probably the same as a “fuckboy”, whatever the hell that even means too.

[chriscdi]

its a sugarcoated way to call you a whore basically

[blackbull9]

You're sex positive and "easy". In this context, easy does not mean bad. It just means you're not stuck up and sex comes naturally to you.

[BUNroaster]

Same this as a fuck boy. Basically you're a good sex partner or you're just looking for sex in relationships but not ideal for further deep relations. Its a rude term but to be taken lightly

[InferiorElegy]

I'm guessing you're the same as a fuck boy only female.

[H8INCHES]

Guys want to fuck you but not be with you. He's also conveying to other guys that you are easily available to be fucked.

[beatcoock]

Ready to have sex with anyone. I am not sure though

[Anonymous]

Men come around fuck you and leave, basically you slutty and easy

[boggboss]

Ready to fuck most guys that walk

[Coulis]

In my day that was a hoe.

[Meldrum]

Apparently, someone considers you easy.

[Guido]

Somebody they want to fuck but not date.

[flexin-on-yuu]

Hoe and you play with guys

[GAGSucksBalls1]

It means, you need new "friends"

[Valnac]

An easy lay.

[meep990]

Wifey material