It is when you are so nervous about something, you masturbate.
My Nervous Masturbation, yesterday, wasn't the best because I was nervous about the final exams.
You use a masturbator, hand, dildo, etc. that you or someone intentionally make the thing your masturbating with extremely cold. Then you masturbate with it, typically giving a orgasmic shivering nut.
Cold Masturbation is the best kind of masturbation!!!
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