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It means that an intelligent person who does stupid things is still stupid. You are what you do.

Another variation is "beauty is as beauty does" or "ugly is as ugly does".
"are you stupid or something?"
"stupid is as stupid does"
by chocolate fingers August 09, 2006
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Sep 17 Word of the Day
Fredagsmys is pretty much the most holy tradition of Sweden. The word origins from two words; β€œfredag” and β€œmys”, which roughly translates to Friday and cozy. Every Friday, all Swedes drive by the supermarket to buy ingredients for taco, soda and chips. Then, they all sit down in their sofas with their families or friends and watch telly. Usually, the parents fall asleep after a few glasses of wine or beer while the kids stuff themselves with chips until they have a stomach ache.
Now it's the end of the week; it is time for fredagsmys!
by popsicle power June 19, 2011
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a catch-all term that basically means that stupid people are gonna keep on doing stupid things because that's what they are, period. The term was popularized in the 1994 Tom Hanks 3-hour blockbuster movie Forrest Gump.
1. Look at several trends, fads and fashions from the past number of years. Many things got dumber and dumber and in this 21st Century many stupid people did evil and stupid things and a lot of people fell for all the lies and B.S. Stupid is as stupid does. Abe Lincoln said you can't fool all the people all of the time. I hope to God he was right.

2. ...
"If God gives you nothin' but lemons, then you make some lemonade"
"The early bird catches the fuckin' worm,
Rome wasn't built in a day"

"Now life's like a box of chocolates,
You never know what you're going to get"
"Stupid is as stupid does and all the rest of that shit"

Come'on pretty baby, call my bluff
'Cause for you my best was never good enough

Bruce Springsteen
by I Saw U2 Live Twice June 14, 2009
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