Top Definition
A person who is a slut and who would be in the Syltherin House at the Hogwarts School of Witchcraft and Wizardry.

Alternate defintions: a slut named Katherine.
"Dude, she's all over our Facebook convos. And did you see her lack of shirts on Halloween? WHAT a slutherine."
by justaguy123 November 11, 2011
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