Brainsturbating

When you masturbate without any physical contact, stimulating your sexual nerves by using brainwaves to arouse yourself and by fooling your reproductive parts into believing there is actual physical contact. ATTENTION : This requires masterhood training.

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.

when you can't concentrate on anything at all, as if your brain was occupying all of its time with masturbation. Much like an extended brain fart that won't go away.