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1.
The act of masturbating with one self to the beat of a song. Can also be used in other tenses such as; Masturbeating or Masturbeated.
Billy just told me how much the band Dragonforce has changed his life since he only used to masturbeat to Rick Astley.
by William O'brien April 30, 2012
 
2.
a song that often plays on the radio while you masturbate
sunshine by atmosphere is my masturbeat
by assy mcsluttyballs January 25, 2010