"Fuck" is
one of the most versatile of all swear/curse words. It can mean a variety of things:
1) to have sex
2) to screw
something up (or in more formal words, to mess something up)
3) one of the filler words used in a sentence humorously.
... and many more.
Again, the word "fuck" is the classic insult that you lash toward somebody that you don't like and/or has offended you.
1) Boyfriend: "Hey, Jenny..."
Jenny: "What?"
Boyfriend: "Wanna get crazy?"
Jenny: "
What do you mean? Are you gonna make love to me?"
Boyfriend: "No... I'm going to fuck you. ( ͡° ͜ʖ ͡°)"
2) "Alright Jeremy, don't fuck it up!"
3) Boss: "Everyone, I would like to present to you this-- of fuck, what's it called again, Travis?"
Travis: "It's called the mini-model for
the Animal Rescue County."
Boss: "*phew* Thank you. Couldn't have done it
without you."
4) Gangsta: "Dude, you short for a nice guy."
Dude: "I'm not short! Fuck you!"