F-word 
noun informal
Used as a euphemism for the word ‘fuck’ because of the latter’s taboo status: these days, F-words no longer horrify so many people...
- I would like to see notices, or even laws, prohibiting the use of the F-word and other obscenities in all public places.
- Teenage speech in Greenock includes the F-word as verb, adjective, adverb, or expletive in almost every sentence.
- Indeed, since today's universal F-words have largely surrendered their old power to shock or even, perhaps, to intensify, it would be good to see some of the old expletives creeping back into the language.