Top Definition
Based on a Craigs' List post. When a guy puts a magnum condom over a banana, does himself in the ass and then deepthroats the banana because he was "feeling slutty".
"Man, I was feeling frisky last night so I decided to magnum banana myself. I splooged all over my roommates new carpet."
by Boshanks April 01, 2007
5 Words related to Magnum Banana

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