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Being a freak by ogling somebody shamelessly; named after the crazy French boy himself (Lupin).
-Girl, you should have seen Rose at Miss Thang's Party!
-What did she do?
-Rose was getting her Lupin on; she looked at everything with pants and a deep voice! She even pinched Salvatore's butt and made out with him!
-Wow...Rose is weird when we're not in school...
by RatchetBoo July 12, 2003

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