Top definition
A 'well-hung' Greek person, member of the underground. Violent and very often 'packing some serious heat'. Often denoted by their keen sense of style and affection of technology.
'Wow, he really IS like all efthimiou down there..!' ,
'Dont be staring at him like that, he will go all efthimiou on us!'
by Jason Donovan May 15, 2008
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