motherfucker UK /mʌðəˌfʌkə/US /mʌðɚˌfʌkɚ/noun 7exclamation 1forms 1 noun7 •(vulgar, offensive) a very bad and cruel person whom others hateUp against the wall, motherfucker.There's an aggressive motherfucker! •(vulgar) Any person, often but not always with the connotation that the person is disliked or is threatening.Check out this motherfucker.Look at that motherfucker. •(vulgar) To an extreme degree.I jammed my finger in the door yesterday. It hurt like a motherfucker.You mess with me, and I will come at you like a motherfucker. •(vulgar) An extremely intense experience, often but not always negative.War is a motherfucker.Traffic congestion was a motherfucker. •(vulgar) A good very close friend or relative.How’ve you been, you crazy motherfucker?Who's hanging on, motherfucker? •(vulgar) One who engages in incest with their mother. •(vulgar) One who engages in sex with a mother, not necessarily one's own. exclamation1 •(vulgar) Expressing dismay, discontent, or surprise. formsmotherfuckers