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 08, 2007
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 02, 2005
This term applies to people who are extremely intelligent. If a brainiac were a superhero, their brain would definitely be their secret weapon.
My boss Paul is such a brainiac I don't ever have to use Google, HE is my human Google.
by MereBear803 April 18, 2011
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 12, 2004
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 06, 2003
Someone who is addicted to getting head.
Girls love Metaphor and I love em back, addicted to getting head, chicks call me the brainiac.

From the Boondocks on Adult Swim

by DiDo25878 December 11, 2007
When sombody gives you head while playing videogames
Yo girl can you give me a brainiac while I play Call of duty
by Spudz13 February 15, 2014
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