Top Definition
A seemingly never-ending virus usually contracted in Las Vegas from a Charlestown sickling
DUNNY: Man, I was dunnygaming last night and I don't feel so good today. I thought that's what it was anyway...
SASSTO: Well, what was it?
DUNNY: I caught the Sistoitis.
SASSTO: Oh man! Sorry!
by Kirtan February 20, 2009
5 Words related to Sistoitis

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