A Rosanna Dick is a sex move - popular throughout Queensland, Australia, especially the Gold Coast.
A Rosanna Dick usually involves one partner being morbidly obese, and the sexual intercourse occuring on the beach.
During penertration, a Rosanna Dick occurs when the sand finds its way into the action thus causing a ''Ro(sand)anna Dick'
Nathan: Did you hear that chick that tried to have sex with that really fat man?
Emma: Yeah apparently while they were going at it they did a Rosanna Dick!