A doppeldick is another seemingly identical dick. This can be in reference to your own dick or
two others that you have encountered. “Doppeldick” is a
riff on doppelgänger, a ghostly
double or counterpart of a living person.
Wow, I totally
saw your doppeldick at the sauna
today.
Damn, this underwear is such a perfect fit, it would only also fit my doppeldick!