Top definition
a mental brush-off to an undesirable or uninteresting activity.

common amongst teenagers, usually accompanied with an almost imperceptible movement at the corner of the eyes.

less prevalent, but well developed, amongst adults with a desire to simplify their lives.
He did an immediate brainshrug when his mum asked him to get back before the 3 am curfew.
by sty October 31, 2007
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