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Short for sprog no boner.

Commonly used when something/someone is so attractive, a male does not have time to gain an erection before he ejaculates.
1. Duuuuuuude, check it out! Barbaras bending over to pick up her handbag......uerrrggghhhh....I just spronoboed.

2. Nicks mum is spronobo material.
by methmatitian October 20, 2010
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