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It literally means sex goddess of the sea in Irish. People that have this name are usually extremely sexually driven, and have a pure beauty that will make you feel like bashing your skull against a radiator because of how ugly you are.

Amazing in bed, amazing bod, hella hot and sassy as f*ck, you get it all with the síof.
Person 1: I saw Síofra earlier *proceeds to bash head against radiator*
Person 2: Dude....
by nicmas January 05, 2017
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