When you're taking a bath, jacking off and then bathing in your own semen.
"Goddamn it David, your masterbathing clogged the drain again!"

"Yeah, Kirk seems like a smart guy, but he's just too busy masterbathing to actually teach us."

Masterbathing is more private and intimate than dunk-tank-wanking.
by Tha 69 Boize January 17, 2013
Top Definition
Masterbathing is the act of bating with your masters or daddy's ,dan and phil.
i'm masterbathing with my daddy's dan and phil. I would do anything they say, they are my masters.
Dil Howlter often masterbathes with his masters dan and phil.
by mirror butt March 07, 2016
The act of bathing thoroughly and for a lenghty period of time.
If you are in the shower for more than 45 minutes, you are masterbathing.
by CaptainOJ May 23, 2007

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