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1.A debbie downer, party pooper, or an otherwise buzz killing individual named after NFL quarterback Joe Flacco

2.When you are unable to achieve an erection in a sexual situation
While drinking around Billy, Billy said, "what would your parents think of that?". To which i responded stop being a Flaccid Flacco.

I wanted to give my girlfriend birthday sex, but i was being a Flaccid Flacco.
by bob da builder3 February 08, 2010