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A refinement of the spitroast position in which two guys take a women, one in the mouth and the other in the vagina.

To achieve the 'Sydney Harbour Bridge' the guys at each end raise their arms at a 45 degree angle over the woman and hold hands while banging.
Johnny, I really enjoyed doing the Sydney Harbour Bridge with you the other night. Let's go and find a willing skank so we can do it again.
by Spitroaster October 07, 2007
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