your biological father as opposed to your stepfather.
So we’re having this party at my bio-dad’s summer house and we’d love if you could join us?
by mkfresh October 16, 2007
biological father, as opposed to the person your mother married after divorce
So we’re having this party at my bio-dad’s summer house and we’d love if you could join us?
by mk fresh October 23, 2007
The guy that knocked you up and either bailed or you kicked him to the curb. Not involved in the child's life except maybe enforced support payments. If you're a dude, what the baby mama calls you.
Tiffany met her bio-dad for the first time last week. Her first reaction was "What was Mom thinking?"
by sendmorecoffee July 10, 2008
What a casual relationship might end up as for the guy. The male part of the fertilization process. See sperm donor
That bio dad has 4 other kids by 4 other chicks.
by Filamena C June 17, 2008
The S.O.B. who fathered you but didn't take the time or care to ever meet you.
I never met my bio-dad, that sob, Charles Carroll Palmisano.
by Safffernellie December 05, 2009

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