Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: f, the first letter of fuck

eff

 verb
     
eff [intransitive] British English spoken informal
1

effing and blinding

swearing:
Did you hear her effing and blinding at him?
2

eff off!

used to tell someone to go away instead of saying fuck off
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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