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A homosexual person who has not come to terms with their sexuality is said to be below deck.

below deck was initially coined to describe the various stages which lead to the coming out of homosexuals.

To fully understand this expression, one must realise that for many years, no one bothered putting much thought regarding the whereabouts of the closet, which happens to be... below deck.
How could Dan come out of the closet? he doesn't even realise that he is still below deck.
by froggus March 28, 2010
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