Top Definition
The substantial and long-sustained decrease in intelligence and social aptitude test scores measured in many aspects of one's life starting roughly the time they become friends with a particular individual. There is no cure for the Williams Effect.
My friends tell me my social sensibilities have decreased upon moving in with my roommate. #TheWilliamsEffect

I thought I was immune to the Williams Effect until I found myself discussing MMA and WWE wrestling after a few short weeks of hanging with Alex.
by SheldonMCohen February 08, 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