- euphemism for the taboo word fuck: eff off
- eff and blind ⇒
to use obscene language
WordReference Random House Unabridged Dictionary of American English © 2026
eff•ing
(ef′ing),USA pronunciation adj., adv. [Slang.]
- Slang Terms(used as an intensifier).
- euphemism for fucking, with ef as spelled form of the name of the initial letter 1940–45
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