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1.
An adjective derived from the words demi and blonde.

Demi meaning half

and

Blonde meaning... well... stupidly fail

Can be a girl or guy.
Girl: I don't understand Pi.
Guy: Pie is a cake-ish thing people eat.
Girl: Wow ur such a demi-blonde
Guy: But my hair is brown.
Girl: Half blonde... stupid
by Azivin March 19, 2010