Visionary yo-yo dieting in which you sometimes appear very buff to your friends, and sometimes you appear very fat.
"What's going on with Steve? He had a beer belly last week, and now he has abs."
"I don't know man, I think he's having a Matt Damon Effect"
"I don't know man, I think he's having a Matt Damon Effect"
by superawesomeguy1496 October 6, 2011

When one finds themselves completely infatuated with any character played by Matt Smith, no matter how evil or manipulative said character is. Confusion plays a big role in this phenomena as overwhelming feelings of lust are met with strong twinges of guilt. See also the concept of “uglyhot” and the power of unconventional attractiveness.
“Why am I so unbelievably attracted to Prince Philip in Netflix’s The Crown?
“Don’t worry - you’re not actually attracted to the late Duke of Edinburgh - you’re just experiencing the Matt Smith Effect.”
“Don’t worry - you’re not actually attracted to the late Duke of Edinburgh - you’re just experiencing the Matt Smith Effect.”
by Late Night Thoughts September 12, 2022

the phenomena in Dungeons and Dragons , where players and Dungeron Masters are never able to live up to the incredible kills of Matt Mercer , The DM GOD
Because of The Matt Mercer Effect , many people have quit playing Dungeons and Dragons because they unable to live up to the awesomeness of Matt Mercer
by BellasaurusTheJust June 28, 2021

Bird #1: Omg it’s Matt!
Bird #2: Oh wow he’s sooo cute!
Bird #3: WE LOVE YOU MATT!!!
Matt: What can I say, it’s the Matt Bruce Effect.
Bird #2: Oh wow he’s sooo cute!
Bird #3: WE LOVE YOU MATT!!!
Matt: What can I say, it’s the Matt Bruce Effect.
by Ursecretsanta November 28, 2020

Bird #1: Omg it’s Matt
Bird #2: Oh wow he’s soo cute!
Bird #3: We love you Matt!!!
Matt: What can I say, it’s the matt-bruce effect
Bird #2: Oh wow he’s soo cute!
Bird #3: We love you Matt!!!
Matt: What can I say, it’s the matt-bruce effect
by Ursecretsanta November 30, 2020

by Pappa_mike September 24, 2025
