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 March 31, 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 08, 2007

The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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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 18, 2005

The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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An idiot. moron
"...then he got stung by the entire swarm of bees. What a brainiac."
by Robert December 12, 2003

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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Ryan Aleksandrs Musa
The fool is such a brainiac
by PiGuy May 23, 2004

The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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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

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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a bad headache.
damn man, i smoked too much, i feel all brainiac.
by Dickie Moist October 07, 2003

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt