A rice pyramid is a slang term, popular amongst sailors, for a homosexual orgy involving a triangular number of men. A majority of the men must be of Asian or Indian heritage.
Bob was really looking forward to his rice pyramid this evening.
A rice pyramid is a sexual act, often popular with naval and ex naval servicemen. It involves a triangular number of men, naked and copulating. At least 3 of the participants at the top of the pyramid have to be of Chinese descent.
Bob was really looking forward to his rice pyramid tonight.