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When the mind is self-titillated and excited to the point of arousal but without stimulating the usual body parts.

Basically, stimulating your own mind by reading porn, role-playing or other activities that require high levels of mental engagement and activity.
Reading posts on Craigslist's Casual Encounters is my favorite way to brainsturbate.

After my girlfriend brainsturbates for several hours, she becomes an insatiable fucktoy.
by Amber's boyfriend September 29, 2009
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