" Bill Bryson even has several paragraphs devoted to this remarkable word in his charming book, The Mother Tongue. Your teacher almost certainly meant that your boyfriend was putting you in a state of mental confusion or distress - "he f** ed with your head" would be another way to say this. " If a burly man in a bar says, "You'd better stop looking at me that way, dude, or I'll f ** you up" it would be best to comply.
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