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A variation on the term "Effing and Blinding", meaning to swear or curse profusely. Used in the North of England, notably by one Karl Pilkington in an episode of the Ricky Gervais Show.
Karl: I've just slagged off that octopus, but at no point was I effing and jeffing about it.
by AnaWanaMia? May 17, 2006