adjective, adverb Slang.
- (used as an intensifier).
verb (used with or without object), interjection
- fuck: Stop effing around and get to work! Eff you, you lout!
- the word “fuck”; the f-word: peppering his speech with superfluous and highly offensive effs.
- eff off, Go away!: Eff off and die, you piece of Martian scum!
- euphemism for fuck taboo eff off
- eff and blind slang to use obscene language
1943, euphemism for fuck, representing the sound of its first letter. Related: Effing.