Taffia
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Taffia is a term humorously applied to groups of Welsh people who practice nepotism, or live in an ethnic enclave. The word is a portmanteau of Taff, a colloquialism for the people of South Wales, and Mafia.
The phrase is largely used in a non-abusive sense, as a joke by Welsh people themselves and others living in Wales, although some may find it offensive. As a consequence, migrants from Wales have taken the funny side of the argument and are trying to adopt it as a legitimate cultural identifier.
The Irish equivalent, Murphia, is less common.