Green’s Dictionary of Slang

Morobar n.

[‘Moro is the brand name of a caramel and nougat layered chocolate bar currently made by Cadbury and sold in Australia, New Zealand, and the Middle East. This type is similar to the Mars bar or American-style Milky way bar’ (wikipedia)]

(NZ gay) derog. term for the dominant partner in anal sex.

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[NZ]W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 59: [D]erogatory terms like Morobar (in reference to the chocolate covered confectionary; the dominant partner in anal sex).