Definition of fucks:
(v) :
(transitive) To have sexual intercourse with.
(v) :
(intransitive, literally) To have sexual intercourse; to copulate.
(v) :
(intransitive or transitive) To have penetrative sex (as opposed to oral sex, etc.).
(v) :
(transitive) To insert one's penis, a dildo, etc., into a person or a specified orifice or cleft sexually; to penetrate.
(v) :
(transitive) To put in an extremely difficult or impossible situation.
(v) :
(transitive, usually derogatory) Used to express great displeasure with, or contemptuous dismissal of, someone or something.