Top Definition
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"
#fat #lazy #buff #abs #matt damon
von superawesomeguy1496 6. Oktober 2011
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