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1.
One who masturbates to a professional degree and does so to a professional calibur.
That guy is so good at jerkin' his wang, he's a masturbationist.
by Jonathan Merkel November 24, 2004
 
2.
Simply, one who masturbates. Often confused with the term "masturbator" which is completely absurd.
I masturbate, therefore I am a masturbationist.
by FouyA August 15, 2003