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Diphallia. Having two penises (or penes) but one set of testicles.

Also the sexual act of using said double-penis in exploration of one or two orifices.
"I have a whamster."

"You know those two girls who left the party with me last night? I gave them a whamster."

"Having a whamster totally rules."
by whamdog May 27, 2009
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