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Someone who is a dad by their sperm which was used to fertilized the egg, but they are a terrible father. So bad of a father that one doesn't want them to be named as their father, so they would use 'sperm daddy.' Just because they are the sperm to your egg and nothing more.
No this is my sperm daddy. He was never a real father to me. He just produced the sperm.
by ilostmyvirginitytoaprotracter January 22, 2016
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