fuck / fək/ vulgar slang • v. [tr.] 1. have sexual intercourse with (someone). ∎ [intr.] (of two people) have sexual intercourse.2. ruin or damage (something).• n. an act of sexual intercourse. ∎ a sexual partner.• interj. used alone or as a noun (the fuck) or a verb in various phrases to express anger, annoyance, contempt, impatience, or surprise, or simply for emphasis.PHRASES: go fuck yourself an exclamation expressing anger or contempt for, or rejection of, someone.not give a fuck (about) used to emphasize indifference or contempt.PHRASAL VERBS: fuck around spend time doing unimportant or trivial things. ∎ have sexual intercourse with a variety of partners. ∎ (fuck around with) meddle with.fuck off [usu. in imper.] (of a person) go away. fuck someone over treat someone in an unfair or humiliating way.fuck someone up damage or confuse someone emotionally.fuck something up (or fuck up) do something badly or ineptly.DERIVATIVES: fuck·a·ble adj.