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The act of sexually arousing a female. As her vagina becomes wet, her basement floods.
Guy: "I'm flooding the basement right now."

Girl: "You sure are, now fuck me!"
by ProfessorOak January 05, 2010
getting an erection.
guy 1: "houston, we have a problem."

guy 1: "i'm flooding the basement."

guy 2: "oh shit, just think about a chair, it'll go away."
by ProfessorOak February 01, 2009