The definition of a gazabo is slang for a guy or a fellow.
The slang term you use to refer to a guy you know but don't really like is an example of gazabo.
See gazabo in Webster's New World College Dictionary
noun pl. gazabos or gazaboes
< Sp gazapo, an artful knave, back-form. < gazapatón, foolish talk, ult. < Gr kakemphaton, neut. of kakemphatos, ill-sounding, equivocal
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