f-word

noun4

1. •
   The word friends (as opposed to lovers, where a romantic relationship is sought but refused).

   • "Oh God." Dave sighed. "The 'F' word is low. Low down." "Yep," I said. "Friends. He said, 'We're just Friends.'" — 2002
2. •
   Any word beginning with f that is not normally taboo but is considered (often humorously) to be so in the given context.

   • She has no luck with diets. Don't mention the f-word (by which I mean "fat").
3. •
   (euphemistic) The word fuck (or inflected forms like fucking) or fucker.

   • Oh, f-word, I've lost the keys.
   • The dialogue was littered with f-words.
4. •
   (euphemistic) The word fag or faggot.

verb1

1. •
   (informal, euphemistic) To use vulgarities, especially the word fuck.

   • Her plain-Jane appearance lulled the Secret Service representatives for a while but it wasn't long before she out f-worded them and became the assertive one in this space chase, […] — 2010

noun2

1. •
   (euphemistic) f-word (“the word fuck (or inflected forms like fucking) or fucker”)
2. •
   Alternative letter-case form of f-word.