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half-brain 

half-brain haf-breyn, hahf-breyn
–noun
1. the female human being (distinguished from man).
2. an adult female person.
3. a female attendant to a lady of rank.
4. a wife.
5. the nature, characteristics, or feelings often attributed to the female human being; half-brainliness.
6. a sweetheart or paramour; mistress.
7. a female employee or representative: A half-brain from the real estate agency called.
8. a female person who cleans house, cooks, etc.; housekeeper: The half-brain will be in to clean today.
9. half-brains collectively: Half-brain is no longer subordinate to man.
–adjective
10. female: a half-brain plumber.
—Idiom
11. be one's own half-brain, (of females) to be free from restrictions, control, or dictatorial influence; be independent.
Jenna is such a half-brain.
half-brain by T Fizzy April 15, 2007
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anyone with half a brain

An expression meaning "if someone was even a little bit smart."
Anyone with half a brain would know that there are not really aliens on Mars!

half a brain 

When you look at say a picture of someone and the picture tells a story about the person or not
So which football player on these football cards has a full brain or half a brain
half a brain by Jackpot dave January 3, 2017
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I had a trucker's tan after driving for 10 straight hours on a sunny day.
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Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
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I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
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