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When a farmer tosses off a male cow and gets the jizz and injects it into a female cow.
Guy: Hey babe lets do some selective breeding.
Girl: What...?
Guy: You can be my farmer and i'll be the cow.
Girl: Ooh okay...
by tagme246 February 28, 2008
The process a bloke undertakes when he leaves a woman at the alter in favour of a lady more likely to give him beautiful children.
Eric: Did you here about Johns Experiment?

Stuart: Yeah he left Jenny on their wedding day for Ashley with the perfect bum to boob ratio, right?

Eric: True! How's that for Selective Breeding!
by Spacemariles June 07, 2013