When a person masterbates while they are using the bathroom
"Kelly is such a bathsturbater! I mean she masturbating in front of me while she was peeing!"
by stellaa165678 June 16, 2009
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"Dude, did you see that video that was leaked of Brittney Spears bathsturbating?"
"Yeah, dude, that was revolting!"
by Thatonedefiniitionguy November 27, 2016
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