sperm daddy 

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.

sperm daddy by ilostmyvirginitytoaprotracter January 22, 2016

spermdaddy

A spermdaddy is a noun used primary in the sperm oil industry. Spermdaddy is a compound word consisting of the words "sperm" meaning sperm oil and "daddy" meaning the oldest, best, or biggest example of something. The largest or most profitable batch of sperm oil is often refered to as the spermdaddy of the year.

This month's record spermdaddy is the largest batch we've had in years!

spermdaddy by Dick Buster Cherry January 4, 2023