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When a male joins the gay community or behaves in a homosexual-like manor that suggests that he should.
Nick: "Where is George? He isn't usually late to football practice."

Paul: "I heard he had nail appointment."

Nick: "I heard he needs a brown card."
by Chiiiiiips April 17, 2010
You still have your brown card if you are an anal sex virgin.
To take someones brown card you are the first person to have anal sex with them. See v card.
Last night I took that girls brown card.
by pink6789 February 01, 2009