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Popularized in the song of the same title by Meryn Cadell. A type of marriage or relationship between a man and a woman whereby one or both are gay/lesbian, but are together to mask their sexual orientation or keep up an approved appearance for family, friends or other social pressures.
At a Wedding:

girl: Wow, Billy and Sara make a great couple! They're so good together.

guy: Are you nuts?!? Billy's gay, dude! His dad would cut him out of the will if he found out. This is a straight up jonny and betty union.
by 2305jcn September 29, 2011
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