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
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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
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"...then he got stung by the entire swarm of bees. What a brainiac."
by Robert December 12, 2003
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a girl that gives head/brain
yo that girl is a braniac she knows how 2 do it rite
by mm October 29, 2003
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