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A fake fancy name for your grandpa's old smelly willy. He says it when he tries to cover up the fact that he's still peeing in the pool.
My grandpa called it a fadonger when he peed in the pool and the lifeguard yelled at him.
My grandma said he used to fadonger in the bathtub when I was born.
He tried to fadonger in the lake, but the fish ran away.