Learn how to say Effing correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word eff:
noun & verb
used as a euphemism for ‘fuck’.
eff and blind
informal use expletives; swear:
I scrabbled for my clothes, effing and blinding
[blind from its use in expletives such as blind me (see blimey)]
adjective & adverb
1950s: the letter F represented as a word