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A group sex act where a peeled banana is inserted into a woman's vagina (hence the name). A second, unpeeled banana is inserted into the anus, causing the woman to clench, squeezing the first banana out of her vagina. The banana is then eaten and enjoyed. In the midst of the anal clenching, the second banana is also ultimately squeezed, providing snack for the rest of the group sex party.
Ruthie, Brent and I did had a good time last night; we totally did a banina on some chick. It was delicious.
by clairedynamo August 21, 2010

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