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(Pronounced as a mixture of man and onion. MAN-YUN) A homosexual male sexual position involving a minimum of fifty men. The participants enter a large room and proceed to wrap them selves in concentric circles around each other, as if peels in an onion. Anal penetration is assumed to ensue during the wrapping process to ensure connectivity.
How come you're walking so funny today, Steve?

Dude, that manyun last night really did in my rectal cavity.
by Person who wrote stuff November 01, 2008
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