What does it mean when a guy says “I’ll fuck you up.” to a woman?

Anonymous
My sister was talking to this boy As he kept on being a creep and trying to get her to come to his house when she hardly knows him. So he was like to her “I’ll fuck you up.” When she wasn’t listening. Then she was like “do u mean beat me up and he said “yeah.” Does he mean be violent or sexual?
What does it mean when a guy says “I’ll fuck you up.” to a woman?
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