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The act of masturbation when a man wraps his white bed sheets around his penis and masturbates with it around said penis until ejaculation in which doesn't take the sheet off of the penis, then the man then falls asleep with the sperm and sheet making a mold of the man's penis looking like a ghost.
Bill: Hey Jim, I ghosturbated last night and my mold was 7 inches!

Jim: I did it too, but my mold was only 5.5 inches.
by SergeantBooty December 26, 2014
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