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Similar to a "Spitoon", Commonly used in brothels as the depository for semen.

Slang for mouth
"Gunther pulled out and relieved himself in the testoon, careful not to miss"
"The Girls emptied the Testoons and Spitoons every night before locking up"
Slang - "Shut your testoon you imbecile"
by Gan Iordon May 13, 2018
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