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 cheesemac October 16, 2007

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Top Definition
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 Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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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

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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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

The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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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 Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt