Top Definition
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

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Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

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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

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

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