Top Definition
When someone's explanatory preface becomes part of their name. Derek's sister's name is just Lex, but I can't just say, "Lex," I have to say, "Derek's Sister Lex," or else confusion will ensue.
Max: Remember Jacky Chen?
Vivienne: You mean Jack?
Max: No. I mean Jacky Chen.
Vivienne: That's such a Derek's Sister Lex situation.
Max: :3
by SVEN:3 February 02, 2010

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