As a verb jeff
is to play or gamble with em quads, throwing them as dice.
As a noun meff is
(liverpool|pejorative) an objectionable, an unkempt person or a tramp.
jeff
English
Proper noun
(
en proper noun)
A diminutive of the male given name Jeffrey or Jeffery.
meff
English
Noun
(
en noun)
(Liverpool, pejorative) An objectionable, an unkempt person or a tramp.
References
* A Dictionary of Slang and colloquialisms of the UK
* Merseytalk - see under section M