When a guy has three or more children by different mother's. Especially when the children were born at the same time.
She won't talk about the father of her child because he's a serial daddy.
by Cemetery Man September 1, 2015
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A man who knocks up multiple women and is likely to take no responsibility in his actions.
Guy 1: Did you hear Arnold got another girl pregnant?

Guy 2: What?! He's definitely a serial baby daddy.
by kingslayer1234 May 25, 2020
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