To have sexual intercourse with someone:
“Bro, I fucked her so hard last night”
To express disgust, anger:
Disgust. “
Ew, you are fucking gross. That’s nasty.”
Anger. “Oh my
god! Go fuck a rhino you fat pig!”
To
add emphasis to a sentence:
I can’t beleive you fucking did that! That’s fucking sick, bro!