Acronym that means "For Your Sexual Incompetence". When one is informing someone who is clueless about a sexual term. FYSI can be used the same way as FYI but of course FYSI is directed towards sexual terms.
Yasi: Your fellatio is getting worse!
Willy: Fellatio? What is that?
Yasi: FYSI..Fellatio is oral sex!
Willy: Fellatio? What is that?
Yasi: FYSI..Fellatio is oral sex!
by TriollatioTata February 02, 2010
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