When ones penis curves to the side like a banana due to excessive masturbation or a bad posture when masturbating.
"Fuck, my penis is bent to the left!"
"Dude, you should've alternated hands like we told you; it's the only known way of preventing Banana Syndrome."
"Dude, you should've alternated hands like we told you; it's the only known way of preventing Banana Syndrome."
by Vodalus April 7, 2010
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