A kick-ass abbreviation for the words: "spontaneous boner". If you're a rocket scientist, this means that the penis will become erect for no apparent reason.
See Morning Wood or Afternoon Wood.
Jack to John: "I have a spon-bon..."
John: "You know what I do? I flip my boner up into my waistband. It hides it AND it feels awesome. Once, I almost blew a load into my bellybutton."
Jack: "Shit! Don't have time!"
Hannah: "Jack, is that a banana in your pocket, or are you just happy to see me?"
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