Green’s Dictionary of Slang

meff n.

[? pron. of SE methylated spirits, often drunk by alcoholic tramps]

a dirty, smelly person; a vagrant.

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[UK]K. Sampson Awaydays 83: Poelly smacked this grock, big fucken meff, really twatted him but would the cunt go down.
[UK]N. Griffiths Stump 151: It’s ‘meff’, innit? Yer’ve just caught sight of yerself in the wing mirror so the word is ‘meff’.