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 8, 2013
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The steven williams effect is when a steven is rather really annoying or just downright irritating and keeps talking about german nationalism and never shuts up for a hard-on for otto von bismarck and people affected by the effect suffer from the following insanity,anxiety,depression,autism.
Do you ever hear about the steven williams effect and how it effects people.
by Moth Man76 December 4, 2018
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The phrase refers to the condition where an American Idol contestant, with no talent, goes on the show hoping to acquire fifteen minutes of fame (or infamy). This phenomenon does not specify whether the contestant has an accurate self-perception of how terrible they are.

American Idol producers rely on this percentage of the contestant population to put together the first few shows of each season.
How can she actually think she would make it to Hollywood? It must be the William Hung Effect
by e009 January 17, 2007
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