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could be used as in "definetly" or "of course"
Jim: Do you have to put your marshmallow in the fire?

Clark: Dude, it's a no brainer, as a rule of thumb campers should put their marshmallow in the fire.
by Nosseir April 15, 2007
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Dec 1 Word of the Day
"Man fuck Donald trump, he wants to build a wall and don't pay taxes!!"
by January 30, 2017
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2
Dude 1: Will you take the money?

Dude 2: Yes I will! It's a no brainer.
by nick_g August 12, 2011
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3
A dumb question or response. Something one shouldn't even have to think about it.
Dude1: Hey, man, where's the basement?
Dude2: Try downstairs, bright spark!

Girl: Whales are... big.
by MischiefMaker December 28, 2003
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4
Not needing a brain to operate task in question
Hey, working a till in Macdonalds is a no brainer which is just as well as chavs need the work
by Little Miss Mayonnaise May 26, 2005
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5
Something so obvious to be correct/appropriate, that it requires no contemplation to decide on.
It was a no-brainer for Zack to wear a condom when he banged that disease infected whore (ewwwww).
by efulitz January 08, 2004
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6
noun. A person (particularly a female) who will gladly accept head but wont return the favor. Most commonly technical virgins who aren't yet accustomed to much sexual behavior. (Or simply just a prissy bitch)
Kenny: Hey you know any females that give good head?
Eli: Ohhh! how bout Jessica? Dude, I heard that girl swallows!!!
Kenny: wtf? Oh hell naw man she's definetely a no brainer. and her dad's a cop..you got me fucked up dawg.
by jajkbnkn January 23, 2011
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