1. The fleshy area between the thighs of a male human. A Combination of the words Man and banana.
2. The curved penile shaft.
Many believe the word originated out of a simple misunderstanding between a Chinese speaking person and an Englishman.
"Q proceeded to vomit blood after being struck in the manana by the disease-ridden prostitute."
"My manana is so big, I have to wrap it around my leg."