Fuck is an English word that is generally considered profane, that in its most literal meaning refers to the act of sexual intercourse. However, by extension it may be used to negatively characterize anything that can be dismissed, disdained, defiled, or destroyed, and it is due to the convergence of these two weighty concepts (sex and destruction) that the term can carry such overloaded emphasis, although it is frequently used as a mere intensifier.

"Fuck" can be used as a noun, verb, adjective, adverb, pronoun, or interjection and can logically be used as virtually any word in a sentence (e.g. "Fuck the fucking fuckers"). It hence has various metaphorical meanings. The verb "to be fucked" can mean "to be cheated" (e.g. "I got fucked by a scam artist"). As a noun "a fuck" or "a fucker" may describe a contemptible person. "A fuck" may mean an act of copulation. The word can be used as an interjection, and its participle is sometimes used as a strong emphatic. The verb to fuck may be used transitively or intransitively, and it appears in compounds, including fuck off, fuck up, and fuck with. In less explicit usages (but still regarded as vulgar), fuck or fuck with can mean to mess around, or to deal with unfairly or harshly. In a phrase such as "don't give a fuck", the word is the equivalent of "damn", in the sense of something having little value. In "what the fuck", it serves merely as an intensive.