Top Definition
A smartphone, or any small, multifunction, touchscreen communications device which effectively allows the user to stop thinking.

Named for the Handbrain devices in Howard Tayler's Schlock Mercenary.
Ever since Kaff got that new Handbrain, he's barely been talking with us at all.
by Dr. Jingo June 10, 2012

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 Mug

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