Top Definition
Mildly insulting phrase denotes silly behaviour, actions or thoughts usually attributed to a child or immature person.
"Don't get angry at your little bro., he did not mean to pull your hair, he is a two-year old bird brain"
by Muyuna December 11, 2004

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some one who is dumber than a rock.
antonio ran into a park car. lol he is such a damn bird brain.
by aymeryia March 04, 2009

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Soft and offensive. Just like you.

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A very stupid person (mainly American.)
Shut your damned trap, you bloody birdbrain!
by JQPublic April 05, 2010

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Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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An annoyingly stupid and shallow person.
Sheila is such a birdbrain, she is always forgetting where her keys are.
by Supercords June 06, 2012

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The Urban Dictionary Mug

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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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really dumb and ugly males who scratch their testicles al day long and like to interact with other bird brains. Hobbies include xbox,shooting,talkin about xbox and talkin about shooting...NOW NOW NOW NOW
ur bird brain is acting like a bird brain..
ur bird brain is being stupid!!!
by non bird brain January 27, 2011

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
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