Fuck is an English wor that, as a verb, means "to have sexual intercourse". It can also be used as several other grammatical forms describing an unpleasant person; its participle "fucking" is sometimes used merely as a strong emphatic. Its use is considered profane and offensive in some formal, polite, or politically-correct circles. On the other hand, it may be common or even expected in informal and domestic situations, or among culturally liberal social groups and types.