Of course it is a hoax. But the article below has some real knee slappers in it. Recommend:

https://knowyourmeme.com/memes/tim-walz-horse-semen-story-hoax

Edit: I think I changed my mind on this.

The more I read and learn about Tim's early involvement with forming an LGBTQ club at the high school he taught at a few years after this semen incident, the revelation that he and his wife befriended a 'not yet out' gay student and Tim's involvement in trans rights, tampons in boys bathrooms, writing an E.O. that allows 'Pedophilia' as a sexual orientation, etc., allowing no limits on time frame for aborting/killing a baby and so many other terrible decisions, I wonder if 'ol Timmy is actually a partaker of strange behaviors himself. Bestiality or group orgy participation doesn't seem that far out of the realm of possibilities for creating the need for a stomach pumping...