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To masturbate with beast-like force. The act of extreme self-pleasure, sometimes involving painful sensations. It comes from the root of Beastiality, but it should not be confused with beastiality because this type of self-pleasure does not involve an animal. It only involves the animal-like force to pleasure ones self.
"As a single man, when I feel extra horny, I participated in beasturbation while watching The Office."

"Pam engaged in beasturbation so intensely using a guitar that it became out of tune for 2 years."
by coolpeople9809 August 28, 2011
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