A man that fathers a child but basically doesn't do much else.
"Why don't you ask your husband to watch the kids for girls night out?" Girl #1 asks.

"Girl please. He aint no daddy, he's just a sperm donor. I'll see if I can get a sitter." Girl # 2 says.
by Bollywood Beast May 19, 2011
when a father is not involved in their childs life AT ALL.
counselor:how do u feel about ur father?
child:hes a piece of shit? i dont claim him as my father hes more like a spermdonor.
by ONLY CHILD September 26, 2006
A Sperm Donor is a guy who goes to a Sperm Bank/Clinic and masturbates until he ejaculate all of his sperm into a cup. Then the clinic is supposed to give it to a girl who wants to have a kid.

The sperm donor's intention is to merely gets paid for donating his sperm and have no financial responsibilities for the child that comes from the girl who injects his sperm into her vagina! - Period!

However, some girls try to sue the guy who donated his semen to her for child support, KNOWING that the guy only donated his sperm cuz he thought he wouldn't have to support the child!
*Location: Sperm Clinic*

Smart, successful and sexy teenage boy (18 years old) after masturbating and ejaculating out all of his sperm turns to the nurse and says: "Okay, here's my sperm.- This is anonymous and I won't have to pay child support later cuz that's what a sperm donor is, right?"

Nurse: Absolutely! Now here's your $600 for your donation.

****** 9 Months Later*****

Girl who injected the guys sperm and birthed a baby gets a lawyer to call the guy who jacked off for money: "Hello, your sperm was responsible for the birth of this child, so I'll see you in court to discuss you paying child support to this girl for the next EIGHTEEN YEARS!

Guy: WTF?!?!?!?!?! THAT'S NOT FAIR! - THIS IS SO FUCKING MESSED! HOW IS THIS EVEN ALLOWED?!?!

Lawyer: Federal Law: Your Sperm=Your Baby. - See you in court.

***The End***
by Penisboy123 December 31, 2010
The top or pitcher in the act of fellatio.
Willie almost managed to swallow the whole load of choad, but the sperm donor made such a large deposit to the Linda Lovelace fund, that some dribbled down his chin.
by Niemand of Chaos March 29, 2005
someone who constantly brags or praises somebodii else
"Kobe is way better than Jordan"
"w/e dude ur such a sperm donor, Jordan's the best there is, the best there was, and the best there ever will be"
by alexander johnson August 29, 2006

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