Tha 69 Boize
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.
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