Term of mild disrespect used to describe bright, studious people, such as scientists, chess-players or spelling bee champions. Plural of brainiac. Synonymous with certain usages of brain, geek, nerd etc.
Only brainiacs hang out at the library for fun.
by Linton November 6, 2003
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1: A British Television show that was bought by G4TV, which contains funny, stupid, and just plain unneeded science experiments. It often involves the use of breasts.

2: Someone who's life is dedicated to accumulation of all the world's knowledge.

3: A big waste of -The Omega Master's time.
"Did you see Brainiac last night? That chick was hot!!!"

"Ned is too freaking smart, a regular Brainiac."

"Why did I even bother to post up Brainiac?"-The Omega Master
by -The Omega Master September 3, 2005
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A person whose attempt at intelligence fails spectacularly. Usually used sarcastically in the phrase "what a brainiac".
"...and then his entire system crashed. What a brainiac."
by John May 13, 2004
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sarcastic. used when denoting someone's lack of intelligence, i.e. they try an idea and it fails miserably.
"Nice Job, brainiac." emphasis must be put on 'brainiac' or else it loses its effectiveness.
by Tengu April 1, 2005
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One who is not only intelligent, but gives the best blowjobs.
My girl gives great head and is incredibly smart; but when I think about it, she's always been a brainiac.
by Bryce King September 8, 2007
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A girl who not only is very good at, but also thoroughly enjoys giving head
My girl sucks me off on a daily basis, she's a brainiac fo' sho'!!
by jacob banuelos May 19, 2005
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