In some of the Southern Italy slangs, it means someone who lacks physical (but often also rational) abilities
Alessandro is NOT "fiacco"
by Alex from Italy September 02, 2009
Top Definition
Usally sexy. nice body. very nice and understanding, kind hearted person who loves to have a good time.
damn that girl has to be a fiacco.
the fiacco sisters are ballers.
man that girl needs to get some fiacco in her life.
by napolean6969 April 05, 2008

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